Inferno is not a single boss fight. It is a staged gauntlet with escalating difficulty. The exact boss roster may shift with patches, but the current community consensus describes a multi-phase structure that tests different skills.
Phase 1 — Elite Sentinels: The gauntlet opens with two elite sentinel enemies that fight together. These are tougher versions of the elite waves you faced in Ancient Battlefields. Kill priority: take down the caster sentinel first — its ranged attacks are harder to dodge in Inferno's tighter arena. The melee sentinel is kiteable.
Phase 2 — Infernal Warden: After the sentinels fall, an Infernal Warden spawns. This boss has moderate health but uses a large-area flame breath attack with a clear telegraph — the warden inhales before breathing fire. Dodge perpendicular to the breath cone, not backward. Attack during the cooldown after the breath ends.
Phase 3 — Core Guardian: The Guardian has higher health and introduces arena hazards — flame pillars that erupt from the ground in a pattern. Learn the pillar sequence. The Guardian will try to pin you against the pillars with knockback attacks. Stay mobile, use the pillars as line-of-sight cover against ranged attacks, and punish the Guardian after it commits to a charge.
Phase 4 — Inferno Core: The final boss of the dungeon. The Core combines mechanics from all previous phases — flame breath, summoning hazards, and enrage behavior at low health. The key difference is speed: everything comes faster. This phase rewards cooldown management above all else. Save your dodge and heal skills for the Core's burst combos, and only commit to your damage rotation during clearly safe windows.
Key tip: Cooldown literacy is the difference between clearing Inferno and wiping at 20% boss health. Know which of your skills are for damage, which are for survival, and never use a survival skill for damage. If your heal is on cooldown when the Core enrages, you lose.