Tainted Hellrazor — guide

In short

Tainted Hellrazor is a high-difficulty boss whose fight revolves around Poison debuffs and a hidden, secret skill: fail to burst him down inside the window and he dumps an all-target nuke on your team. That's why cleanse, Decrease ATK and fast damage matter far more here than raw bulk.

He's farmed for high-tier artefact sets and progression resources; a fast, clean clear is a separate goal once your core five are built.

Mechanics

• Decrease ATK AoE — hits the whole team and slaps Decrease ATK on it for a couple of turns.
• Poison AoE — hits everyone, stacks several small Poison debuffs plus Weaken, and also ramps up the boss's own damage. The Poisons on your champions are the fuel for the secret skill.
• Turn-meter wipe — empties every ally's turn meter and unlocks the secret skill; don't count on turn order after it lands.
• Secret nuke — an all-target attack with pure damage, an unblockable and unresistable Stun, and an instant detonation of every Poison on your champions. Per-target damage scales with how many turns of Poison are left on that target.
• Passives — immune to Stun, Freeze, Sleep, Provoke, Block Active Skills, Block Passive Skills, Fear, True Fear and Petrification, plus HP-swap, HP-balance and cooldown-increase effects. MAX HP-scaling damage is capped (roughly 10% of the boss's MAX HP).

What your team needs

• Cleanse and Block Debuffs — the core answer. Strip the Poisons before the secret skill fires and the detonation hits for almost nothing. The Stun can't be resisted, but the Poisons can be removed.
• Accuracy 200–250+ on your debuffers so Decrease DEF and Weaken actually stick; the exact number depends on difficulty.
• Decrease ATK on the boss to blunt both AoEs, plus Decrease DEF / Weaken for your own damage.
• Survivability: 40–60k+ HP and 2.5–3k+ DEF on support, with Shields, Increase DEF or Block Damage timed for the big hit.
• Speed 200–250+ on support so cleanse comes back between boss casts.
• Burst: while the secret skill is unlocked, enough damage shoves it back into hiding — hold Increase ATK, Decrease DEF and Ally Attack for that window.

Teams

Budget (rare/epic): Kael, Stag Knight, Doompriest, Coldheart, Melga Steelgirdle. Kael and Coldheart carry the damage, Stag Knight brings Decrease DEF/ATK, Doompriest cleanses a debuff every turn and Melga keeps Shields up.

Mid-game: Uugo, Fahrakin the Fat, Geomancer, Demytha, Dark Kael. Uugo handles Decrease DEF and healing, Fahrakin adds Ally Attack and extra damage, Geomancer works through HP Burn, Demytha covers the team with Block Damage.

Endgame: Gnut, Acrizia, Cardiel, Mithrala Lifebane, Marius the Gallant. Gnut and Marius are the damage core, Acrizia chips in with MAX HP damage (mind the cap), Cardiel and Mithrala keep the team clean and alive.

Common mistakes

• Running no cleanse and hoping RES saves you — the Stun is unstoppable, but the Poisons are exactly what you should be removing.
• Letting Poisons sit on your champions: the longer they tick, the harder the detonation lands.
• Bringing Stun, Freeze, Provoke or cooldown-increase specialists — the boss is immune and those slots are wasted.
• Spreading damage evenly: without a burst window the boss gets his cast off and the run falls apart.

Tips

• Set your auto-battle priorities so cleanse fires first; on Doompriest and Uugo it's natural, elsewhere check skill order.
• Sets: Lifesteal on damage dealers, Speed and Accuracy on support, Protection or Stoneskin on whoever eats the Stun, Toxic only if you're sure you can strip your own Poisons.
• Masteries: take the cleanse and speed nodes in the support tree; skip anything that relies on Stun, Freeze or Provoke on the boss.
• Hold one panic button (Shield / Block Damage / Increase DEF) for right after the turn-meter wipe — that's when the team is most exposed.
• Don't build the whole team around MAX HP nukers: the ~10% cap makes them a supplement, not the plan.