Cocytus

Quick facts:

Cocytus

Cocytus

Type

Boss Arena

Location

Inferno

Associated Boss

Lucifer

Encounter Type

Ascension Battle Final Phase

Hazards

Fire Waves, Slam Zones, Group Coordination Mechanics

Cocytus is the final boss arena located within the Inferno region of 33 Immortals. It serves as the battleground for the climactic Ascension encounter against Lucifer, presenting players with one of the most challenging trials in the game.

Overview

Cocytus is reached after players clear a series of Torture Chambers and survive divine wrath events in the Inferno. The arena marks the culmination of the Ascension Battle, designed to push a full 33-player raid group to its limits through relentless attacks and coordination-intensive mechanics.

Environment

Contrary to its origin in classical literature as a frozen river, Cocytus in 33 Immortals is reimagined as a searing battlefield consumed by divine fire and rage. The area features continuous hazards that increase in intensity with each phase of the battle.

Battle Features

When the fight begins, players face Lucifer’s escalating assault as the arena transforms with each phase:

• Slam attacks from massive arms that mark and crush specific ground zones.
• Fire waves sweeping across the battlefield, forcing rapid repositioning.
• Circular targeting mechanics that demand grouped movement and coordinated responses.

Hazards

Cocytus is laced with dangers beyond Lucifer’s direct attacks. Players must constantly navigate:

• Holy fire storms that deal persistent damage over time.
• Environmental mechanics that punish isolated movement.
• AoE targeting that escalates based on the number of surviving Immortals.

Strategy

To survive Cocytus, players should enter with strong coordination and the right builds:

• Equip movement-friendly weapons such as Daggers or Bows to evade AoEs.
• Use relics like Crimson Crown to apply steady pressure through Bleed effects.
• Bring co-op powers like Revival Shield to recover quickly during wipe-prone moments.
• Maximize Empathy and team synergy for successful revivals and shared shielding.

Importance

Cocytus serves not only as the setting for a high-stakes boss fight but as the narrative climax of Inferno. It reflects the spiritual and physical test imposed on the Immortals as they challenge divine punishment and ascend toward rebellion.