Tainted Klyssus — guide

In short

Tainted Klyssus is a hard-mode boss (Doom Tower) with a golem and his minions. He hits hard, revives his minions at HP thresholds, and punishes teams that rely on poison or control. Farm him for Doom Tower rewards and valuable artifacts.

Mechanics

• Glacial Eruption: AoE attack that reduces your team's Accuracy by 50% for 2 turns, decreases Turn Meter by 30%, and cleanses all debuffs from the boss. Cooldown 4 turns.
• Frozen Reckoning (passive): When the boss's HP drops below thresholds (80%, 60%, 45%, 30%, 15%), he attacks all enemies once and revives all dead minions at full HP. This attack ignores a portion of your DEF for each living ally and can freeze; the chance and ignore-DEF scale with the number of living minions.
• Winter's Might (passive): Immune to Poison and weakens Poison Sensitivity. Takes increased damage from HP Burn. When HP Burn activates on the boss or his minions, the minions' MAX HP is reduced (capped at 50%). A similar effect occurs with the 'Hit' debuff (likely Bomb).
• Corrupted Immunity (passive): Immune to Stun, Freeze, Sleep, Provoke, Block Active Skills, Block Passive Skills, Fear, True Fear, Petrification, HP Swap, HP Balance, and cooldown increase.
• Awakened Weakness (passive): Boss damage to a target champion is affected by that champion's awakening level (reduces or increases damage depending on awakening).
• Almighty Power (passive): Damage from skills that scale off enemy MAX HP is capped at 10% of the boss's MAX HP.

What your team needs

• HP Burn: Essential to reduce minion MAX HP and deal damage to the boss. Bring multiple HP Burn champions.
• Decrease DEF / Weaken: To kill minions quickly and increase damage.
• Cleanse / Block Debuffs: To remove the Accuracy down and avoid the freeze from threshold attacks.
• High Accuracy: 200+ for hard to land HP Burn and Decrease DEF.
• Speed and Survivability: 200+ SPD for supports, high HP/DEF to survive AoEs. Avoid poison and control champions.

Teams

• Budget: Geomancer (HP Burn), Fahrakin the Fat (HP Burn, Decrease DEF), Coldheart (HP Burn, TM control), Doompriest (cleanse), Melga Steelgirdle (shield, heal). Why: HP Burn reduces minion HP, cleanse removes ACC down, shields keep you alive.
• Mid-game: Geomancer, Fahrakin the Fat, Stag Knight (Decrease DEF/ATK), Doompriest, Uugo (Decrease DEF, Block Buffs, heal). Why: More consistent debuffs and survivability.
• Endgame: Acrizia (HP Burn, Decrease DEF), Gnut (HP Burn, Decrease DEF), Cardiel (cleanse, revive), Cecilia The Red Hope (cleanse, block debuffs), Mithrala Lifebane (cleanse, increase ACC). Why: Top-tier supports keep team alive and debuffs up.

Common mistakes

• Bringing poison champions: the boss is immune and poison does nothing.
• Ignoring minions: they revive at thresholds and can overwhelm you with freeze and damage.
• Not using HP Burn: you'll struggle to permanently reduce minion MAX HP.
• Low Accuracy: your debuffs get resisted, leading to slow kills and deaths.

Tips

• Use Lifesteal or Immortal sets on damage dealers for sustain.
• Take masteries that improve Accuracy and survivability (e.g., Warmaster for boss damage).
• Save cleanse for after Glacial Eruption to remove ACC down.
• Time your HP Burn to land before threshold attacks to reduce minion MAX HP before they revive.
• Block Revive is unreliable; better to reduce minion HP with HP Burn.