diff --git a/Assets/Battle/BaseCard.cs b/Assets/Battle/BaseCard.cs
index a1c2062..7285421 100644
--- a/Assets/Battle/BaseCard.cs
+++ b/Assets/Battle/BaseCard.cs
@@ -33,6 +33,8 @@ public abstract class BaseCard
                 return "Skill";
             case CardType.Enchantment:
                 return "Enchantment";
+            case CardType.Default:
+                return "Default";
             default:
                 throw new System.ArgumentException("CardType unknown", "cardType");
         }
@@ -40,7 +42,7 @@ public abstract class BaseCard
     public string GetEffectText() {return this.effectText;}
 
     public bool IsPermanent() {
-        return this.type == CardType.Enchantment;
+        return this.type == CardType.Enchantment || this.type == CardType.Default;
     }
 
     public bool IsEphemeral() {
diff --git a/Assets/Battle/BattleClock.cs b/Assets/Battle/BattleClock.cs
new file mode 100644
index 0000000..a2d067b
--- /dev/null
+++ b/Assets/Battle/BattleClock.cs
@@ -0,0 +1,29 @@
+public class BattleClock {
+    public delegate void TimeChangedAction(BattleTime timeNow);
+    public event TimeChangedAction OnTimeChanged;
+
+    private int mRoundNumber;
+    private RoundStep mStep;
+
+    public BattleClock() {
+        mRoundNumber = 0;
+        mStep = RoundStep.None;
+    }
+
+    public void AdvanceRound() {
+        mRoundNumber++;
+        mStep = RoundStep.StartOfRound;
+        TriggerOnTimeChanged();
+    }
+
+    public void AdvanceToStep(RoundStep step) {
+        mStep = step;
+        TriggerOnTimeChanged();
+    }
+
+    private void TriggerOnTimeChanged() {
+        if (OnTimeChanged != null) OnTimeChanged(this.Now);
+    }
+
+    public BattleTime Now {get => new BattleTime(mRoundNumber, mStep);}
+}
diff --git a/Assets/Battle/BattleClock.cs.meta b/Assets/Battle/BattleClock.cs.meta
new file mode 100644
index 0000000..116f55f
--- /dev/null
+++ b/Assets/Battle/BattleClock.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 22aaeef7020f83f47a03c0b2d8186afa
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Battle/BattleController.cs b/Assets/Battle/BattleController.cs
index 19e25c7..de01d26 100644
--- a/Assets/Battle/BattleController.cs
+++ b/Assets/Battle/BattleController.cs
@@ -34,6 +34,9 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
     private HandPlayability<HeroCard> heroHandPlayability;
     private HandPlayability<MonsterCard> monsterHandPlayability;
     private TurnIntentions<MonsterCard> monsterIntentions;
+    private BattleClock clock;
+    private BuffManager buffManager;
+    private ParticipantActivity participantActivity;
 
     private delegate void BattleStateChangedAction();
     private event BattleStateChangedAction OnBattleStateChanged;
@@ -93,6 +96,9 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
         this.monsterDeck = new BattleDeck<MonsterCard>(
             this.monsterCardDatabase, parameters.MCardIds.Cast<int>().ToArray(), mCardOwners);
 
+        this.clock = new BattleClock();
+        this.buffManager = new BuffManager(this.clock);
+        this.participantActivity = new ParticipantActivity();
         this.playArea = new PlayArea();
 
         this.heroHandPlayability = new HandPlayability<HeroCard>(
@@ -151,6 +157,7 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
     }
 
     private IEnumerator RunBattleRound() {
+        this.clock.AdvanceRound();
         this.state.AdvanceToTeamTurn(TeamChoice.Heroes);
         
         this.damageTriggers.RemoveAll(t => t.Expiration == TriggerExpiration.StartOfNextHeroTurn);
@@ -172,10 +179,14 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
 
         this.state.AdvanceToTeamTurn(TeamChoice.Monsters);
         yield return RunMonsterTurn();
+
+        this.clock.AdvanceToStep(RoundStep.EndOfRound);
+        this.participantActivity.NextRound();
     }
 
     private IEnumerator RunHeroTurn() {
         // Start of hero turn
+        this.clock.AdvanceToStep(RoundStep.StartOfHeroTurn);
         OnBattleStateChanged();
         this.monsterIntentions.ResumeIntentions();
 
@@ -200,6 +211,7 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
         }
 
         // End of hero turn
+        yield return this.playArea.UseHeroDefaults(this.heroes, this.participantActivity, UseHeroDefault);
         if (STABLE_HAND_STYLE) {
             this.heroDeck.DiscardInExcessOf(3);
         } else {
@@ -208,11 +220,15 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
         foreach (BattleHero hero in this.heroes) {
             hero.TickStatuses();
         }
+
+        this.clock.AdvanceToStep(RoundStep.EndOfHeroTurn);
+        
         OnBattleStateChanged();
         this.monsterIntentions.PauseIntentions();
     }
 
     private IEnumerator RunMonsterTurn() {
+        this.clock.AdvanceToStep(RoundStep.StartOfMonsterTurn);
         OnBattleStateChanged();
         yield return new WaitForSeconds(0.5f);
         
@@ -253,6 +269,8 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
         foreach (BattleMonster monster in this.monsters) {
             monster.TickStatuses();
         }
+
+        this.clock.AdvanceToStep(RoundStep.EndOfMonsterTurn);
         OnBattleStateChanged();
     }
 
@@ -275,8 +293,11 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
 
         this.heroEnergy.PayForCard(card);
         this.heroDeck.RemoveCardFromHand(card);
+        this.participantActivity.NotifyParticipantUsedCard(card.Owner, card);
         yield return card.Use(this, this, battlePlayerControls);
-        if (card.IsPermanent()) {
+        if (card.Type == CardType.Default) {
+            // Already added to playArea by effect
+        } else if (card.IsPermanent()) {
             this.playArea.AddPlayedHeroPermanent(card);
         } else if (card.IsEphemeral()) {
             this.heroDeck.MoveCardToOblivion(card);
@@ -288,6 +309,17 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
         OnBattleStateChanged();
     }
 
+    public IEnumerator UseHeroDefault(DefaultHeroCard card) {
+        if (!card.Owner.CanUseDefault()) {
+            yield break;
+        }
+
+        yield return card.UseDefault(this, this, battlePlayerControls);
+
+        CheckState();
+        OnBattleStateChanged();
+    }
+
     public IEnumerator UseMonsterCard(MonsterCard card) {
         this.monsterEnergy.PayForCard(card);
         this.monsterDeck.RemoveCardFromHand(card);
@@ -444,7 +476,11 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
     public int DealDamage(DealDamageEffect effect) {
         if (effect.Target == null) return 0;
 
-        int damageDealt = effect.Target.DealDamage(effect.Amount);
+        int amount = effect.Amount;
+        if (effect.Source != null) {
+            amount += this.buffManager.GetTotalBuffAmountOfType(effect.Source, BuffType.Power);
+        }
+        int damageDealt = effect.Target.DealDamage(amount);
         foreach (DamageTrigger dt in this.damageTriggers) {
             if (dt.IsTriggeredBy(effect)) {
                 EnqueueActivatedTrigger(dt);
@@ -499,6 +535,10 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
         effect.Target.AddStatus(effect.Status, effect.Amount);
     }
 
+    public void BuffParticipant(BuffParticipantEffect effect) {
+        this.buffManager.AddBuff(effect, this.clock.Now);
+    }
+
     public void Rotate(RotateEffect effect) {
         if (effect.Positions == 0) return;
 
@@ -554,6 +594,13 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
         }
     }
 
+    public void SetupDefault(DefaultEffect effect) {
+        DefaultHeroCard previousDefault = this.playArea.SetupDefault(effect);
+        if (previousDefault != null) {
+            this.heroDeck.MoveCardToDiscard(previousDefault);
+        }
+    }
+
     public void ArmDamageTrigger(DamageTrigger damageTrigger) {
         this.damageTriggers.Add(damageTrigger);
     }
diff --git a/Assets/Battle/BattleParticipant.cs b/Assets/Battle/BattleParticipant.cs
index 2255095..38d5750 100644
--- a/Assets/Battle/BattleParticipant.cs
+++ b/Assets/Battle/BattleParticipant.cs
@@ -164,6 +164,10 @@ public class BattleParticipant
         return IsAlive() && !HasStatus(BattleStatus.Stun);
     }
 
+    public bool CanUseDefault() {
+        return IsAlive() && !HasStatus(BattleStatus.Stun);
+    }
+
     public bool HasStatus(BattleStatus status) {
         return this.statuses.ContainsKey(status);
     }
diff --git a/Assets/Battle/BattleTime.cs b/Assets/Battle/BattleTime.cs
new file mode 100644
index 0000000..4dc750f
--- /dev/null
+++ b/Assets/Battle/BattleTime.cs
@@ -0,0 +1,24 @@
+public enum RoundStep {
+    None,
+    StartOfRound,
+    StartOfHeroTurn,
+    EndOfHeroTurn,
+    StartOfMonsterTurn,
+    EndOfMonsterTurn,
+    EndOfRound,
+}
+
+public class BattleTime {
+    private int mRoundNumber;
+    private RoundStep mRoundStep;
+
+    public BattleTime(int roundNumber, RoundStep roundStep) {
+        mRoundNumber = roundNumber;
+        mRoundStep = roundStep;
+    }
+
+    public int RoundNumber {get => mRoundNumber;}
+    public RoundStep RoundStep {get => mRoundStep;}
+
+    public int Int {get => mRoundNumber * 100 + (int) mRoundStep;}
+}
diff --git a/Assets/Battle/BattleTime.cs.meta b/Assets/Battle/BattleTime.cs.meta
new file mode 100644
index 0000000..8e49be6
--- /dev/null
+++ b/Assets/Battle/BattleTime.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: c9c620593374fcf4c985eaf5041b1eff
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Battle/BuffDuration.cs b/Assets/Battle/BuffDuration.cs
new file mode 100644
index 0000000..053cc37
--- /dev/null
+++ b/Assets/Battle/BuffDuration.cs
@@ -0,0 +1,3 @@
+public enum BuffDuration {
+    UntilEndOfNextHeroTurn,
+}
diff --git a/Assets/Battle/BuffDuration.cs.meta b/Assets/Battle/BuffDuration.cs.meta
new file mode 100644
index 0000000..9d87db1
--- /dev/null
+++ b/Assets/Battle/BuffDuration.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 0b7d7799a49ca114481b8b4e0d1d3879
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Battle/BuffManager.cs b/Assets/Battle/BuffManager.cs
new file mode 100644
index 0000000..5fb9af4
--- /dev/null
+++ b/Assets/Battle/BuffManager.cs
@@ -0,0 +1,64 @@
+using System.Collections.Generic;
+using System.Linq;
+
+public class Buff {
+    private BuffType mType;
+    private int mAmount;
+    private BattleTime mEnd;
+
+    public Buff(BuffType type, int amount, BattleTime end) {
+        mType = type;
+        mAmount = amount;
+        mEnd = end;
+    }
+
+    public BuffType Type {get => mType;}
+    public int Amount {get => mAmount;}
+    public BattleTime End {get => mEnd;}
+}
+
+public class BuffManager {
+
+    private Dictionary<BattleParticipant, List<Buff>> mBuffs = new Dictionary<BattleParticipant, List<Buff>>();
+
+    public BuffManager(BattleClock clock) {
+        clock.OnTimeChanged += NotifyBattleTime;
+    }
+    
+    public void AddBuff(BuffParticipantEffect effect, BattleTime timeNow) {
+        List<Buff> current = GetAllBuffsFor(effect.Participant);
+        current.Add(new Buff(effect.Type, effect.Amount, CalculateEnd(timeNow, effect.Duration)));
+        mBuffs[effect.Participant] = current;
+    }
+
+    public int GetTotalBuffAmountOfType(BattleParticipant participant, BuffType type) {
+        int total = 0;
+        foreach (Buff buff in GetAllBuffsFor(participant)) {
+            if (buff.Type == type) {
+                total += buff.Amount;
+            }
+        }
+        return total;
+    }
+
+    public List<Buff> GetAllBuffsFor(BattleParticipant participant) {
+        if (mBuffs.ContainsKey(participant)) {
+            return mBuffs[participant];
+        } else {
+            return new List<Buff>();
+        }
+    }
+
+    private void NotifyBattleTime(BattleTime timeNow) {
+        foreach (List<Buff> buffs in mBuffs.Values) {
+            buffs.RemoveAll(buff => timeNow.Int >= buff.End.Int);
+        }
+    }
+
+    private static BattleTime CalculateEnd(BattleTime timeNow, BuffDuration duration) {
+        if (duration == BuffDuration.UntilEndOfNextHeroTurn) {
+            return new BattleTime(timeNow.RoundNumber + 1, RoundStep.EndOfHeroTurn);
+        }
+        throw new System.Exception();
+    }
+}
\ No newline at end of file
diff --git a/Assets/Battle/BuffManager.cs.meta b/Assets/Battle/BuffManager.cs.meta
new file mode 100644
index 0000000..9312ac5
--- /dev/null
+++ b/Assets/Battle/BuffManager.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ef089e4327ee000469448b5357efc161
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Battle/BuffType.cs b/Assets/Battle/BuffType.cs
new file mode 100644
index 0000000..9720b12
--- /dev/null
+++ b/Assets/Battle/BuffType.cs
@@ -0,0 +1,3 @@
+public enum BuffType {
+    Power,
+}
diff --git a/Assets/Battle/BuffType.cs.meta b/Assets/Battle/BuffType.cs.meta
new file mode 100644
index 0000000..608ca8c
--- /dev/null
+++ b/Assets/Battle/BuffType.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: c870b0605da509b42b5fb4284f6e04f6
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Battle/CardType.cs b/Assets/Battle/CardType.cs
index eb15abe..83e62b5 100644
--- a/Assets/Battle/CardType.cs
+++ b/Assets/Battle/CardType.cs
@@ -3,4 +3,5 @@ public enum CardType {
     Attack,
     Skill,
     Enchantment,
+    Default,
 }
diff --git a/Assets/Battle/CardsHeroes/BlindFuryHCard.cs b/Assets/Battle/CardsHeroes/BlindFuryHCard.cs
index 14e8cf1..4eb1820 100644
--- a/Assets/Battle/CardsHeroes/BlindFuryHCard.cs
+++ b/Assets/Battle/CardsHeroes/BlindFuryHCard.cs
@@ -12,7 +12,7 @@ public class BlindFuryHCard : HeroCard
     public override IEnumerator Use(IBattleEffectApplier effectApplier,
             MonsterViewpoint viewpoint, BattlePlayerControls playerControls) {
         BattleParticipant target = AIUtils.GetNearestMonster(viewpoint, this.owner);
-        effectApplier.Apply(new DealDamageEffect(target, 5));
+        effectApplier.Apply(new DealDamageEffect(Owner, target, 5));
         effectApplier.Apply(new ModifyInsightEffect(-1));
         yield break;
     }
diff --git a/Assets/Battle/CardsHeroes/CrashingPunchHCard.cs b/Assets/Battle/CardsHeroes/CrashingPunchHCard.cs
index 5557915..50f8646 100644
--- a/Assets/Battle/CardsHeroes/CrashingPunchHCard.cs
+++ b/Assets/Battle/CardsHeroes/CrashingPunchHCard.cs
@@ -14,6 +14,6 @@ public class CrashingPunchHCard : HeroCard
         SingleTargeting singleTargeting = new SingleTargeting(new AnyTargetPolicy());
         yield return playerControls.StartCoroutine(playerControls.ChooseTarget(singleTargeting));
         BattleParticipant target = singleTargeting.GetTarget();
-        effectApplier.Apply(new DealDamageEffect(target, 3));
+        effectApplier.Apply(new DealDamageEffect(Owner, target, 3));
     }
 }
diff --git a/Assets/Battle/CardsHeroes/LeadShotHCard.cs b/Assets/Battle/CardsHeroes/LeadShotHCard.cs
index e792840..1245e1f 100644
--- a/Assets/Battle/CardsHeroes/LeadShotHCard.cs
+++ b/Assets/Battle/CardsHeroes/LeadShotHCard.cs
@@ -15,7 +15,7 @@ public class LeadShotHCard : HeroCard
         yield return playerControls.StartCoroutine(playerControls.ChooseTarget(singleTargeting));
         yield return new WaitForSeconds(0.4f);
         BattleParticipant target = singleTargeting.GetTarget();
-        effectApplier.Apply(new DealDamageEffect(target, 2));
+        effectApplier.Apply(new DealDamageEffect(Owner, target, 2));
         yield return new WaitForSeconds(0.8f);
     }
 }
diff --git a/Assets/Battle/CardsHeroes/LightningHatchetHCard.cs b/Assets/Battle/CardsHeroes/LightningHatchetHCard.cs
index e82339b..e18ad8c 100644
--- a/Assets/Battle/CardsHeroes/LightningHatchetHCard.cs
+++ b/Assets/Battle/CardsHeroes/LightningHatchetHCard.cs
@@ -14,6 +14,6 @@ public class LightningHatchetHCard : HeroCard
         SingleTargeting singleTargeting = new SingleTargeting(new AnyMonsterTargetPolicy());
         yield return playerControls.StartCoroutine(playerControls.ChooseTarget(singleTargeting));
         BattleParticipant target = singleTargeting.GetTarget();
-        effectApplier.Apply(new DealDamageEffect(target, 2));
+        effectApplier.Apply(new DealDamageEffect(Owner, target, 2));
     }
 }
diff --git a/Assets/Battle/CardsHeroes/LightningStrikeHCard.cs b/Assets/Battle/CardsHeroes/LightningStrikeHCard.cs
index a1faf34..b5d451a 100644
--- a/Assets/Battle/CardsHeroes/LightningStrikeHCard.cs
+++ b/Assets/Battle/CardsHeroes/LightningStrikeHCard.cs
@@ -14,6 +14,6 @@ public class LightningStrikeHCard : HeroCard
         SingleTargeting singleTargeting = new SingleTargeting(new AnyTargetPolicy());
         yield return playerControls.StartCoroutine(playerControls.ChooseTarget(singleTargeting));
         BattleParticipant target = singleTargeting.GetTarget();
-        effectApplier.Apply(new DealDamageEffect(target, 3));
+        effectApplier.Apply(new DealDamageEffect(Owner, target, 3));
     }
 }
diff --git a/Assets/Battle/CardsHeroes/OilOfSharpnessHCard.cs b/Assets/Battle/CardsHeroes/OilOfSharpnessHCard.cs
new file mode 100644
index 0000000..44be2d9
--- /dev/null
+++ b/Assets/Battle/CardsHeroes/OilOfSharpnessHCard.cs
@@ -0,0 +1,26 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class OilOfSharpnessHCard : DefaultHeroCard
+{
+    public OilOfSharpnessHCard(BattleParticipant owner)
+        : base(owner, HCardId.OilOfSharpness, "Oil of Sharpness", 1, CardType.Default,
+            "Target hero gets +1 power until end of next turn.") {
+    }
+
+    public override IEnumerator Use(IBattleEffectApplier effectApplier,
+            MonsterViewpoint viewpoint, BattlePlayerControls playerControls) {
+        effectApplier.Apply(new DefaultEffect(this));
+        yield break;
+    }
+
+    public override IEnumerator UseDefault(IBattleEffectApplier effectApplier,
+            MonsterViewpoint viewpoint, BattlePlayerControls playerControls) {
+        SingleTargeting targeting = new SingleTargeting(new AnyHeroTargetPolicy());
+        yield return playerControls.ChooseTarget(targeting);
+        BattleParticipant target = targeting.GetTarget();
+        effectApplier.Apply(new BuffParticipantEffect(target, BuffType.Power, 1, BuffDuration.UntilEndOfNextHeroTurn));
+        yield break;
+    }
+}
diff --git a/Assets/Battle/CardsHeroes/OilOfSharpnessHCard.cs.meta b/Assets/Battle/CardsHeroes/OilOfSharpnessHCard.cs.meta
new file mode 100644
index 0000000..e2a1920
--- /dev/null
+++ b/Assets/Battle/CardsHeroes/OilOfSharpnessHCard.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ac807b0678a548a46a0f67b2a4f43fed
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Battle/CardsHeroes/SwordSlashHCard.cs b/Assets/Battle/CardsHeroes/SwordSlashHCard.cs
index b34aa30..f14c24d 100644
--- a/Assets/Battle/CardsHeroes/SwordSlashHCard.cs
+++ b/Assets/Battle/CardsHeroes/SwordSlashHCard.cs
@@ -15,7 +15,7 @@ public class SwordSlashHCard : HeroCard
         yield return playerControls.StartCoroutine(playerControls.ChooseTarget(singleTargeting));
         yield return new WaitForSeconds(0.4f);
         BattleParticipant target = singleTargeting.GetTarget();
-        effectApplier.Apply(new DealDamageEffect(target, 1));
+        effectApplier.Apply(new DealDamageEffect(Owner, target, 1));
         yield return new WaitForSeconds(0.8f);
     }
 }
diff --git a/Assets/Battle/CardsMonsters/GolemBerserkMCard.cs b/Assets/Battle/CardsMonsters/GolemBerserkMCard.cs
index 14c8c13..79d1ceb 100644
--- a/Assets/Battle/CardsMonsters/GolemBerserkMCard.cs
+++ b/Assets/Battle/CardsMonsters/GolemBerserkMCard.cs
@@ -13,11 +13,11 @@ public class GolemBerserkMCard : MonsterCard
     public override IEnumerator Use(IBattleEffectApplier effectApplier, MonsterViewpoint monsterViewpoint) {
         BattleParticipant target = AIUtils.GetNearestHero(monsterViewpoint, this.owner);
 
-        effectApplier.Apply(new DealDamageEffect(target, 8));
+        effectApplier.Apply(new DealDamageEffect(Owner, target, 8));
         yield return new WaitForSeconds(1f);
         foreach (BattleHero hero in monsterViewpoint.Heroes) {
             if (hero != target) {
-                effectApplier.Apply(new DealDamageEffect(hero, 4));
+                effectApplier.Apply(new DealDamageEffect(Owner, hero, 4));
             }
         }
         
diff --git a/Assets/Battle/CardsMonsters/GolemChargeMCard.cs b/Assets/Battle/CardsMonsters/GolemChargeMCard.cs
index cfe058f..7d99aa6 100644
--- a/Assets/Battle/CardsMonsters/GolemChargeMCard.cs
+++ b/Assets/Battle/CardsMonsters/GolemChargeMCard.cs
@@ -14,7 +14,7 @@ public class GolemChargeMCard : MonsterCard
         yield return new WaitForSeconds(0.5f);
         
         BattleParticipant target = AIUtils.GetFarthestHero(monsterViewpoint, this.owner);
-        DealDamageEffect damageEffect = new DealDamageEffect(target, 4);
+        DealDamageEffect damageEffect = new DealDamageEffect(Owner, target, 4);
         effectApplier.Apply(damageEffect);
         StatusEffect statusEffect = new StatusEffect(target, BattleStatus.Stun);
         effectApplier.Apply(statusEffect);
diff --git a/Assets/Battle/CardsMonsters/GolemFistMCard.cs b/Assets/Battle/CardsMonsters/GolemFistMCard.cs
index b89ef0a..406e0ee 100644
--- a/Assets/Battle/CardsMonsters/GolemFistMCard.cs
+++ b/Assets/Battle/CardsMonsters/GolemFistMCard.cs
@@ -11,7 +11,7 @@ public class GolemFistMCard : MonsterCard
 
     public override IEnumerator Use(IBattleEffectApplier effectApplier, MonsterViewpoint monsterViewpoint) {
         BattleParticipant target = AIUtils.GetNearestHero(monsterViewpoint, this.owner);
-        DealDamageEffect damageEffect = new DealDamageEffect(target, 3);
+        DealDamageEffect damageEffect = new DealDamageEffect(Owner, target, 3);
         effectApplier.Apply(damageEffect);
         yield break;
     }
diff --git a/Assets/Battle/CardsMonsters/QuickSwiftDeathMCard.cs b/Assets/Battle/CardsMonsters/QuickSwiftDeathMCard.cs
index 258bd5b..66ee712 100644
--- a/Assets/Battle/CardsMonsters/QuickSwiftDeathMCard.cs
+++ b/Assets/Battle/CardsMonsters/QuickSwiftDeathMCard.cs
@@ -11,7 +11,7 @@ public class QuickSwiftDeathMCard : MonsterCard
 
     public override IEnumerator Use(IBattleEffectApplier effectApplier, MonsterViewpoint monsterViewpoint) {
         BattleParticipant target = AIUtils.GetNearestHero(monsterViewpoint, this.owner);
-        DealDamageEffect damageEffect = new DealDamageEffect(target, 100);
+        DealDamageEffect damageEffect = new DealDamageEffect(Owner, target, 100);
         effectApplier.Apply(damageEffect);
         yield break;
     }
diff --git a/Assets/Battle/CardsMonsters/VampireFangsMCard.cs b/Assets/Battle/CardsMonsters/VampireFangsMCard.cs
index 1dabdb3..53f2085 100644
--- a/Assets/Battle/CardsMonsters/VampireFangsMCard.cs
+++ b/Assets/Battle/CardsMonsters/VampireFangsMCard.cs
@@ -11,7 +11,7 @@ public class VampireFangsMCard : MonsterCard
 
     public override IEnumerator Use(IBattleEffectApplier effectApplier, MonsterViewpoint monsterViewpoint) {
         BattleParticipant target = AIUtils.GetHeroWithHighestHP(monsterViewpoint);
-        DealDamageEffect damageEffect = new DealDamageEffect(target, 2);
+        DealDamageEffect damageEffect = new DealDamageEffect(Owner, target, 2);
         effectApplier.Apply(damageEffect);
         if (damageEffect.AmountDealt > 0) {
             HealEffect healEffect = new HealEffect(this.owner, damageEffect.AmountDealt);
diff --git a/Assets/Battle/CheatBattle.cs b/Assets/Battle/CheatBattle.cs
index 11dee07..2502875 100644
--- a/Assets/Battle/CheatBattle.cs
+++ b/Assets/Battle/CheatBattle.cs
@@ -20,20 +20,24 @@ public class CheatBattle: MonoBehaviour
             HCardId.Eagerness,
 
             HCardId.CrashingPunch,
-            HCardId.LightningHatchet,
             HCardId.BlindFury,
             HCardId.Cover,
             HCardId.Cover,
-            HCardId.Thunderstorm,
             HCardId.Scarring,
-            HCardId.Scarring,
-            HCardId.Meditate,
+
+            HCardId.OilOfSharpness,
             HCardId.IronskinDraught,
+            
+            HCardId.LightningHatchet,
+            HCardId.Thunderstorm,
+            HCardId.Meditate,
         };
 
         int[] hCardOwnerIndexes = new int[16] {
             0, 0, 1, 1, 2, 2,
-            0, 2, 0, 0, 0, 2, 0, 0, 2, 1,
+            0, 0, 0, 0, 0,
+            1, 1,
+            2, 2, 2,
         };
 
         MonsterId[] monsterIds = new MonsterId[3] {
diff --git a/Assets/Battle/DefaultHeroCard.cs b/Assets/Battle/DefaultHeroCard.cs
new file mode 100644
index 0000000..b8f529a
--- /dev/null
+++ b/Assets/Battle/DefaultHeroCard.cs
@@ -0,0 +1,13 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public abstract class DefaultHeroCard: HeroCard
+{
+    public DefaultHeroCard(BattleParticipant owner, HCardId id, string displayName, int cost, CardType type,
+            string effectText)
+            : base(owner, id, displayName, cost, type, effectText) {}
+
+    public abstract IEnumerator UseDefault(IBattleEffectApplier effectApplier,
+            MonsterViewpoint viewpoint, BattlePlayerControls playerControls);
+}
diff --git a/Assets/Battle/DefaultHeroCard.cs.meta b/Assets/Battle/DefaultHeroCard.cs.meta
new file mode 100644
index 0000000..bbe0cfe
--- /dev/null
+++ b/Assets/Battle/DefaultHeroCard.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 6d2e07039087c844c863e1b155f4d983
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Battle/DefaultsManager.cs b/Assets/Battle/DefaultsManager.cs
new file mode 100644
index 0000000..697c800
--- /dev/null
+++ b/Assets/Battle/DefaultsManager.cs
@@ -0,0 +1,42 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class DefaultsManager
+{
+    public delegate IEnumerator UseDefaultAction(DefaultHeroCard card);
+
+    private Dictionary<BattleHero, DefaultHeroCard> mHeroDefaults = new Dictionary<BattleHero, DefaultHeroCard>();
+
+    public DefaultsManager() {
+    }
+
+    public DefaultHeroCard Setup(DefaultEffect effect) {
+        DefaultHeroCard newCard = effect.Card;
+        DefaultHeroCard previousCard = null;
+        BattleHero heroOwner = (BattleHero) newCard.Owner;
+        mHeroDefaults.TryGetValue(heroOwner, out previousCard);
+
+        mHeroDefaults[heroOwner] = newCard;
+
+        return previousCard;
+    }
+
+    public IEnumerator UseHeroDefaults(
+            BattleHero[] heroes, ParticipantActivity activity,
+            UseDefaultAction usedDefaultAction) {
+        foreach (BattleHero hero in heroes) {
+            if (hero == null) {
+                continue;
+            }
+            
+            if (activity.GetNonEmotionCardsUsedThisRound(hero) == 0) {
+                DefaultHeroCard defaultCard;
+                mHeroDefaults.TryGetValue(hero, out defaultCard);
+                if (defaultCard != null) {
+                    yield return usedDefaultAction(defaultCard);
+                }
+            }
+        }
+    }
+}
diff --git a/Assets/Battle/DefaultsManager.cs.meta b/Assets/Battle/DefaultsManager.cs.meta
new file mode 100644
index 0000000..fca1d2b
--- /dev/null
+++ b/Assets/Battle/DefaultsManager.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 9517ccf8137932d458bdd10b84540001
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Battle/Effects/BuffParticipantEffect.cs b/Assets/Battle/Effects/BuffParticipantEffect.cs
new file mode 100644
index 0000000..2b8704b
--- /dev/null
+++ b/Assets/Battle/Effects/BuffParticipantEffect.cs
@@ -0,0 +1,27 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class BuffParticipantEffect : IBattleEffect
+{
+    private BattleParticipant mParticipant;
+    private BuffType mType;
+    private BuffDuration mDuration;
+    private int mAmount;
+
+    public BuffParticipantEffect(BattleParticipant participant, BuffType type, int amount, BuffDuration duration) {
+        mParticipant = participant;
+        mType = type;
+        mAmount = amount;
+        mDuration = duration;
+    }
+
+    public void Apply(IBattleEffectResolver resolver) {
+        resolver.BuffParticipant(this);
+    }
+
+    public BattleParticipant Participant {get => mParticipant;}
+    public BuffType Type {get => mType;}
+    public BuffDuration Duration {get => mDuration;}
+    public int Amount {get => mAmount;}
+}
diff --git a/Assets/Battle/Effects/BuffParticipantEffect.cs.meta b/Assets/Battle/Effects/BuffParticipantEffect.cs.meta
new file mode 100644
index 0000000..f47f577
--- /dev/null
+++ b/Assets/Battle/Effects/BuffParticipantEffect.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 203a8da7e3f13cf478d850b47c3f762e
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
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diff --git a/Assets/Battle/Effects/DealDamageEffect.cs b/Assets/Battle/Effects/DealDamageEffect.cs
index add8423..2aef7f6 100644
--- a/Assets/Battle/Effects/DealDamageEffect.cs
+++ b/Assets/Battle/Effects/DealDamageEffect.cs
@@ -4,11 +4,13 @@ using UnityEngine;
 
 public class DealDamageEffect : IBattleEffect
 {
+    private BattleParticipant source;
     private BattleParticipant target;
     private int amount;
     private int amountDealt;
 
-    public DealDamageEffect(BattleParticipant target, int amount) {
+    public DealDamageEffect(BattleParticipant source, BattleParticipant target, int amount) {
+        this.source = source;
         this.target = target;
         this.amount = amount;
     }
@@ -17,6 +19,7 @@ public class DealDamageEffect : IBattleEffect
         this.amountDealt = resolver.DealDamage(this);
     }
 
+    public BattleParticipant Source {get => this.source;}
     public BattleParticipant Target {get => this.target;}
     public int Amount {get => this.amount;}
     public int AmountDealt {get => this.amountDealt;}
diff --git a/Assets/Battle/Effects/DefaultEffect.cs b/Assets/Battle/Effects/DefaultEffect.cs
new file mode 100644
index 0000000..66cf6e3
--- /dev/null
+++ b/Assets/Battle/Effects/DefaultEffect.cs
@@ -0,0 +1,19 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+public class DefaultEffect : IBattleEffect
+{
+    private DefaultHeroCard mCard;
+
+    public DefaultEffect(DefaultHeroCard card) {
+        mCard = card;
+    }
+
+    public void Apply(IBattleEffectResolver resolver) {
+        resolver.SetupDefault(this);
+    }
+
+    public DefaultHeroCard Card {get => mCard;}
+}
diff --git a/Assets/Battle/Effects/DefaultEffect.cs.meta b/Assets/Battle/Effects/DefaultEffect.cs.meta
new file mode 100644
index 0000000..f62d1a8
--- /dev/null
+++ b/Assets/Battle/Effects/DefaultEffect.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: c713bb4a53fb33249a23147f4f67114c
+MonoImporter:
+  externalObjects: {}
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diff --git a/Assets/Battle/HeroCardDatabase.cs b/Assets/Battle/HeroCardDatabase.cs
index 30e5fec..9302a56 100644
--- a/Assets/Battle/HeroCardDatabase.cs
+++ b/Assets/Battle/HeroCardDatabase.cs
@@ -24,6 +24,7 @@ public enum HCardId {
     LeadShot,
     SmokeBomb,
     Eagerness,
+    OilOfSharpness,
 }
 
 public class HeroCardDatabase : CardDatabase<HeroCard>
@@ -60,6 +61,8 @@ public class HeroCardDatabase : CardDatabase<HeroCard>
                 return new SmokeBombHCard(owner);
             case HCardId.Eagerness:
                 return new EagernessHCard(owner);
+            case HCardId.OilOfSharpness:
+                return new OilOfSharpnessHCard(owner);
             default:
                 throw new System.ArgumentException("HCardId unknown", "id");
         }
diff --git a/Assets/Battle/IBattleEffectResolver.cs b/Assets/Battle/IBattleEffectResolver.cs
index 14410e2..8ecd9ff 100644
--- a/Assets/Battle/IBattleEffectResolver.cs
+++ b/Assets/Battle/IBattleEffectResolver.cs
@@ -13,9 +13,11 @@ public interface IBattleEffectResolver {
     void IncreaseHeroMaxEnergy(IncreaseMaxEnergyEffect delta);
     void IncreaseMaxHP(IncreaseMaxHPEffect effect);
     void ModifyInsight(ModifyInsightEffect effect);
+    void BuffParticipant(BuffParticipantEffect effect);
     void DrawCards(DrawCardsEffect effect);
     void AcquireCards(AcquireCardsEffect effect);
     void Rotate(RotateEffect effect);
+    void SetupDefault(DefaultEffect effect);
     
     void ArmDamageTrigger(DamageTrigger damageTrigger);
 }
diff --git a/Assets/Battle/ParticipantActivity.cs b/Assets/Battle/ParticipantActivity.cs
new file mode 100644
index 0000000..54560d2
--- /dev/null
+++ b/Assets/Battle/ParticipantActivity.cs
@@ -0,0 +1,30 @@
+using System.Collections.Generic;
+using System.Linq;
+
+public class ParticipantActivity {
+
+    private Dictionary<BattleParticipant, List<BaseCard>> mCardsUsedThisRound = new Dictionary<BattleParticipant, List<BaseCard>>();
+
+    public ParticipantActivity() {
+    }
+    
+    public void NotifyParticipantUsedCard(BattleParticipant participant, BaseCard card) {
+        if (mCardsUsedThisRound.ContainsKey(participant)) {
+            mCardsUsedThisRound[participant].Add(card);
+        } else {
+            mCardsUsedThisRound[participant] = new List<BaseCard>() {card};
+        }
+    }
+
+    public int GetNonEmotionCardsUsedThisRound(BattleParticipant participant) {
+        if (mCardsUsedThisRound.ContainsKey(participant)) {
+            return mCardsUsedThisRound[participant].Count(card => card.Type != CardType.Emotion);
+        } else {
+            return 0;
+        }
+    }
+
+    public void NextRound() {
+        mCardsUsedThisRound.Clear();
+    }
+}
\ No newline at end of file
diff --git a/Assets/Battle/ParticipantActivity.cs.meta b/Assets/Battle/ParticipantActivity.cs.meta
new file mode 100644
index 0000000..634a2eb
--- /dev/null
+++ b/Assets/Battle/ParticipantActivity.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: abe2bbff2aef9fc4388e4aad5eb0b1f7
+MonoImporter:
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diff --git a/Assets/Battle/PlayArea.cs b/Assets/Battle/PlayArea.cs
index 38db77a..b6ac69c 100644
--- a/Assets/Battle/PlayArea.cs
+++ b/Assets/Battle/PlayArea.cs
@@ -10,10 +10,12 @@ public class PlayArea
 
     private List<BaseCard> heroPermanents;
     private List<BaseCard> monsterPermanents;
+    private DefaultsManager mDefaultsManager;
 
     public PlayArea() {
         this.heroPermanents = new List<BaseCard>();
         this.monsterPermanents = new List<BaseCard>();
+        mDefaultsManager = new DefaultsManager();
     }
 
     public List<BaseCard> GetHeroPermanents() {
@@ -40,6 +42,24 @@ public class PlayArea
         TriggerPlayAreaChanged();
     }
 
+    public DefaultHeroCard SetupDefault(DefaultEffect effect) {
+        DefaultHeroCard previousDefault = mDefaultsManager.Setup(effect);
+        if (previousDefault != null) {
+            RemoveHeroPermanent(previousDefault);
+        }
+
+        AddPlayedHeroPermanent(effect.Card);
+
+        TriggerPlayAreaChanged();
+        return previousDefault;
+    }
+
+    public IEnumerator UseHeroDefaults(
+            BattleHero[] heroes, ParticipantActivity activity,
+            DefaultsManager.UseDefaultAction useDefaultAction) {
+        yield return mDefaultsManager.UseHeroDefaults(heroes, activity, useDefaultAction);
+    }
+
     private void TriggerPlayAreaChanged() {
         if (OnPlayAreaChanged != null) OnPlayAreaChanged();
     }
diff --git a/Assets/Resources/CardArt/HeroOilOfSharpness.jpg b/Assets/Resources/CardArt/HeroOilOfSharpness.jpg
new file mode 100644
index 0000000..ab26bd3
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diff --git a/Assets/Resources/CardArt/HeroOilOfSharpness.jpg.meta b/Assets/Resources/CardArt/HeroOilOfSharpness.jpg.meta
new file mode 100644
index 0000000..3ad81c8
--- /dev/null
+++ b/Assets/Resources/CardArt/HeroOilOfSharpness.jpg.meta
@@ -0,0 +1,92 @@
+fileFormatVersion: 2
+guid: b5745ed63f80a524ca329b8c41725d97
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diff --git a/TODO.txt b/TODO.txt
index 6945bda..5d95afb 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -7,6 +7,10 @@ Battle
 - Extend BattleState object to contain everything for effect resolver to work
 - Implement a stack/queue to control effects
 - Make battle work with numbers different than 3 vs 3
+- Merge HeroCard and MonsterCard
+- Make Enchantments be dropped as an effect like Defaults
+- No need to start coroutine for targeting
+- Indicate which Default is triggering
 
 Story
 - Make dialogue show letter by letter.