Kosk of Two Skins
Last Updated: April 7, 2026
Kosk of Two Skins Overview
A creature of deception and venom, Kosk wears the skin of his prey and spreads corruption across the battlefield. His power grows with every debuff, turning chaos into lethal damage.
Kosk is an attack-based, poison specialist, that focuses on debuff spreading and activation. His A1 can extend debuffs or instantly activate poisons, this is hard to manage and plan around due to the low activation cost. But at least you are still getting value one way or another.
His A2 places Increased Accuracy on himself before attacking an enemy. This skill applies Poison Sensitivity and two 5% poisons, then spreads them to all enemies. This essentially makes it an AoE poison effect which is lovely. His A3 places Decrease ATK on all enemies, boosts his Turn Meter for each Decrease ATK applied, and activates all poisons instantly. This allows for massive burst damage after setup.
His passive increases his damage and ignores Defense for each active debuff on enemies, scaling up to 50% damage and 30% ignore DEF. He also counterattacks enemies who are under his debuffs. Kosk is also immune to poison, stun, and decrease speed.
Kosk thrives in wave content where multiple enemies allow him to stack debuffs quickly and reach his full potential.
Kosk of Two Skins Skills

10/10
Book Value
Book Priority
Kosk of Two Skins PVE Masteries




![Shield Breaker - Increases damage inflicted to targets under [Shield], buffs by 25% shield-breaker](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/shield-breaker.png)








![Opportunist - Increases damage inflicted to targets with [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs by 12%. opportunist](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/opportunist.png)


![Blood Shield - Places a [Shield], buff on this Champion for 1 turn when this Champion kills an enemy. The value of the [Shield], is equal to 15% of this Champion's MAX HP. Occurs once per turn blood-shield](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/blood-shield.png)








![Rejuvenation - Increases the amount of healing and the value of [Shield], buffs this Champion receives by 5% rejuvenation](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/rejuvenation.png)
![Mighty Endurance - Decreases the damage received by 10% if this Champion has [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs. might-endurance](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/might-endurance.png)




![Wisdom of Battle - Has a 30% chance of placing a [Block Debuffs], buff on this Champion for 1 turn when [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs expire on this Champion. wisdom-of-battle](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/wisdom-of-battle.png)


![Harvest Despair - Has a 60% chance of placing a [Leech], debuff for 1 turn when placing [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs. harvest-despair](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/harvest-despair.png)




![Deterrence - Has a 20% chance to counterattack an enemy when they apply a [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuff on an ally. Cooldown: 1 turn deterrence](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/deterrence.png)


![Fearsome Presence - Increases the chances of placing a [Stun], [Sleep], [Freeze], [Fear], [True Fear], [Provoke], or [Sheep], debuff from Skills or Artifacts by 5% fearsome-presence](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/fearsome-presence.png)




![Shieldbearer - Increases the value of [Shield], buffs this Champion casts by 5% shieldbearer](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/shieldbearer.png)


![Healing Savior - Increases the amount of healing and the value of [Shield], buffs placed by this Champion by 10% if the target ally has 40% HP or less healing-savior](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/healing-savior.png)



![Merciful Aid - Increases the amount of healing and the value of [Shield], buffs placed by this Champion by 15% if the target ally has [Stun], [Sleep], [Fear], [True Fear], or [Freeze] debuffs merciful-aid](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/merciful-aid.png)



![Lasting Gifts - Has a 30% chance to extend the duration of any buff cast by this Champion by 1 turn.
It will not extend [Block Damage], [Unkillable], or [Revive on Death], buffs. lasting-gifts](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/lasting-gifts.png)

![Sniper - Increases the chances of placing any debuff from Skills or Artifacts by 5%.
It will not increase the chances of placing [Stun], [Sleep], [Freeze], [Fear], [True Fear], [Provoke], or [Petrification], debuffs. sniper](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/sniper.png)
![Master Hexer - Has a 30% chance to extend the duration of any debuff cast by this Champion by 1 turn. It will not extend [Stun], [Sleep], [Freeze], [Provoke], [Fear], [True Fear], [Bomb], or [Petrification], debuffs. master-hexer](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/master-hexer.png)




Kosk of Two Skins PVP Masteries




![Shield Breaker - Increases damage inflicted to targets under [Shield], buffs by 25% shield-breaker](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/shield-breaker.png)








![Opportunist - Increases damage inflicted to targets with [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs by 12%. opportunist](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/opportunist.png)


![Blood Shield - Places a [Shield], buff on this Champion for 1 turn when this Champion kills an enemy. The value of the [Shield], is equal to 15% of this Champion's MAX HP. Occurs once per turn blood-shield](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/blood-shield.png)








![Rejuvenation - Increases the amount of healing and the value of [Shield], buffs this Champion receives by 5% rejuvenation](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/rejuvenation.png)
![Mighty Endurance - Decreases the damage received by 10% if this Champion has [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs. might-endurance](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/might-endurance.png)




![Wisdom of Battle - Has a 30% chance of placing a [Block Debuffs], buff on this Champion for 1 turn when [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs expire on this Champion. wisdom-of-battle](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/wisdom-of-battle.png)


![Harvest Despair - Has a 60% chance of placing a [Leech], debuff for 1 turn when placing [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs. harvest-despair](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/harvest-despair.png)




![Deterrence - Has a 20% chance to counterattack an enemy when they apply a [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuff on an ally. Cooldown: 1 turn deterrence](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/deterrence.png)


![Fearsome Presence - Increases the chances of placing a [Stun], [Sleep], [Freeze], [Fear], [True Fear], [Provoke], or [Sheep], debuff from Skills or Artifacts by 5% fearsome-presence](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/fearsome-presence.png)




![Shieldbearer - Increases the value of [Shield], buffs this Champion casts by 5% shieldbearer](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/shieldbearer.png)


![Healing Savior - Increases the amount of healing and the value of [Shield], buffs placed by this Champion by 10% if the target ally has 40% HP or less healing-savior](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/healing-savior.png)



![Merciful Aid - Increases the amount of healing and the value of [Shield], buffs placed by this Champion by 15% if the target ally has [Stun], [Sleep], [Fear], [True Fear], or [Freeze] debuffs merciful-aid](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/merciful-aid.png)



![Lasting Gifts - Has a 30% chance to extend the duration of any buff cast by this Champion by 1 turn.
It will not extend [Block Damage], [Unkillable], or [Revive on Death], buffs. lasting-gifts](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/lasting-gifts.png)

![Sniper - Increases the chances of placing any debuff from Skills or Artifacts by 5%.
It will not increase the chances of placing [Stun], [Sleep], [Freeze], [Fear], [True Fear], [Provoke], or [Petrification], debuffs. sniper](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/sniper.png)
![Master Hexer - Has a 30% chance to extend the duration of any debuff cast by this Champion by 1 turn. It will not extend [Stun], [Sleep], [Freeze], [Provoke], [Fear], [True Fear], [Bomb], or [Petrification], debuffs. master-hexer](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/master-hexer.png)








![Shield Breaker - Increases damage inflicted to targets under [Shield], buffs by 25% shield-breaker](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/shield-breaker.png)








![Opportunist - Increases damage inflicted to targets with [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs by 12%. opportunist](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/opportunist.png)


![Blood Shield - Places a [Shield], buff on this Champion for 1 turn when this Champion kills an enemy. The value of the [Shield], is equal to 15% of this Champion's MAX HP. Occurs once per turn blood-shield](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/blood-shield.png)








![Rejuvenation - Increases the amount of healing and the value of [Shield], buffs this Champion receives by 5% rejuvenation](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/rejuvenation.png)
![Mighty Endurance - Decreases the damage received by 10% if this Champion has [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs. might-endurance](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/might-endurance.png)




![Wisdom of Battle - Has a 30% chance of placing a [Block Debuffs], buff on this Champion for 1 turn when [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs expire on this Champion. wisdom-of-battle](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/wisdom-of-battle.png)


![Harvest Despair - Has a 60% chance of placing a [Leech], debuff for 1 turn when placing [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuffs. harvest-despair](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/harvest-despair.png)




![Deterrence - Has a 20% chance to counterattack an enemy when they apply a [Stun], [Sleep], [Fear], [True Fear], [Freeze], [Petrification], debuff on an ally. Cooldown: 1 turn deterrence](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/deterrence.png)


![Fearsome Presence - Increases the chances of placing a [Stun], [Sleep], [Freeze], [Fear], [True Fear], [Provoke], or [Sheep], debuff from Skills or Artifacts by 5% fearsome-presence](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/fearsome-presence.png)




![Shieldbearer - Increases the value of [Shield], buffs this Champion casts by 5% shieldbearer](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/shieldbearer.png)


![Healing Savior - Increases the amount of healing and the value of [Shield], buffs placed by this Champion by 10% if the target ally has 40% HP or less healing-savior](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/healing-savior.png)



![Merciful Aid - Increases the amount of healing and the value of [Shield], buffs placed by this Champion by 15% if the target ally has [Stun], [Sleep], [Fear], [True Fear], or [Freeze] debuffs merciful-aid](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/merciful-aid.png)



![Lasting Gifts - Has a 30% chance to extend the duration of any buff cast by this Champion by 1 turn.
It will not extend [Block Damage], [Unkillable], or [Revive on Death], buffs. lasting-gifts](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/lasting-gifts.png)

![Sniper - Increases the chances of placing any debuff from Skills or Artifacts by 5%.
It will not increase the chances of placing [Stun], [Sleep], [Freeze], [Fear], [True Fear], [Provoke], or [Petrification], debuffs. sniper](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/sniper.png)
![Master Hexer - Has a 30% chance to extend the duration of any debuff cast by this Champion by 1 turn. It will not extend [Stun], [Sleep], [Freeze], [Provoke], [Fear], [True Fear], [Bomb], or [Petrification], debuffs. master-hexer](https://hellhades.com/wp-content/plugins/rsl-assets/assets/masteries/master-hexer.png)




Dungeon and Boss Blessings
Kosk of Two Skins Relics
Kosk of Two Skins Gear Recommendations
Recommended PVE Stats
SPD, ACC, ATK%, C.RATE, C.DMG
Recommended PVE Artifact Sets
Savage/Lethal, Merciless, Perception
Recommended PVP Stats
SPD, ACC, ATK%, C.RATE, C.DMG
Recommended PVP Artifact Sets
Stoneskin, Savage/Lethal, Feral/Pinpoint



