Eternal Dragon — guide (Iragoth)

In short

Eternal Dragon (Iragoth) is a Doom Tower boss fought for a chest with gear and resources. It tests survivability, debuff control and cooldown manipulation more than raw damage. On high floors, a team without Decrease ATK and cleansing falls apart quickly.

Mechanics

• Summons. Iragoth summons an Ancient Priest and Ancient Guards. The Priest is the main threat: if left alive, the boss sacrifices it, resets his cooldowns and takes an extra turn. Guards heal the boss when no Priest is available.
• A1 — Spike Volley. Hits all enemies and applies Block Active Skills.
• A2 — Spirit Call. AoE damage that scales with your remaining cooldowns; applies Fear to heroes whose skills are not on cooldown.
• A3 — Soul Burst. Puts all your skills on cooldown and fills the boss turn meter.
• Eternal Malice. If a summon fails, Iragoth gains Speed, ignores Unkillable, Block Damage, Shield and part of DEF.
• Immunities. Stun, Freeze, Sleep, Provoke, Block Active Skills, Fear, True Fear, Decrease SPD, Poison and Heal Reduction do not work. HP exchange, HP equalization and turn meter reduction also fail. Increase Cooldown does work.
• Damage cap. Max HP-based skill damage is capped (around 10% per hit in the old data), so rely on HP Burn and regular damage.

What your team needs

SPD: support and debuffers around 200+ to move before the boss. ACC: 250–350+ for Decrease ATK, Decrease DEF, Weaken and HP Burn on high floors. RES: 350–450 if you lack cleansing; the boss has high ACC. HP/DEF: 40–60k HP or solid DEF on everyone, or A2/A3 will delete you.

Key effects: Decrease ATK (main survival tool), Decrease DEF and Weaken for damage, HP Burn for steady damage, cleanse and Block Debuffs, passive healing or shields. Increase Cooldown is excellent to delay A2/A3. Do not bring Poison or Heal Reduction — the boss is immune.

Teams

• Budget: Geomancer, Doompriest, Vogoth, Stag Knight, Rector Drath. Why: Geomancer brings HP Burn, Doompriest cleanses and heals passively, Vogoth supports healing, Stag Knight applies Decrease ATK/DEF, Rector Drath heals and revives.
• Mid-game: Geomancer, Doompriest, Stag Knight, Dhukk the Pierced, Godseeker Aniri. Why: two sources of Decrease ATK/DEF, cleansing, passive healing and buff extension; Aniri keeps the cycle stable.
• Endgame: Marius the Gallant, Gnut, Mithrala Lifebane, Duchess Lilitu, Warlord. Why: Warlord pushes cooldowns, Duchess Lilitu cleanses and blocks debuffs, Mithrala Lifebane supports, Marius and Gnut close the damage. Without Warlord, add more cleansing and Decrease ATK.

Common mistakes

• Ignoring the Ancient Priest: he gives the boss a cooldown reset and an extra turn.
• Building around Poison, Stun or Heal Reduction — Iragoth is immune.
• Letting Decrease ATK fall off: A2 and A3 shred the team.
• Killing Guards before the Priest: the Priest is the bigger tempo threat; Guards mainly heal.

Tips

• Set auto-battle priorities to kill the Priest and use cooldown-increase skills on the boss.
• Damage dealers: Lifesteal or Relentless; debuffers: Accuracy and Perception; support: Speed and Protection for RES.
• Toxic and Stun sets are mostly wasted because of immunities.
• Keep a fast cleanser to remove Fear and Block Active Skills before A2/A3.
• If Eternal Malice is up, do not rely on shields or Unkillable — fall back on Decrease ATK and healing.