PoE Delirium Bosses: Kosis, The Revelation — Omniphobia, Fear Manifest

In Path of Exile (PoE), the Delirium mechanic introduces players to some of the most challenging encounters in the game, including the formidable Delirium bosses: Kosis, The Revelation and Omniphobia, Fear Manifest. These bosses appear in the Simulacrum and can also be encountered in high-tier maps influenced by Delirium mirrors or Delirium orbs. This article explores the mechanics, abilities, and strategies for defeating these two powerful adversaries.

1. Kosis, The Revelation

Kosis, The Revelation is one of the two Delirium bosses, known for his substantial energy shield and a variety of powerful elemental attacks. Kosis can be encountered in the Simulacrum, a special map fragment with distinct layouts, or in Tier 11+ maps when influenced by Delirium mechanics.

Kosis, The Revelation

Mechanics and Abilities

Kosis has a complex set of abilities that make him a dangerous opponent, particularly due to his high energy shield and ability to deal significant elemental damage.

• Energy Shield: Kosis possesses a large energy shield, and unlike most enemies, chaos damage does not bypass his energy shield, similar to how Shavronne’s Wrappings works. This makes Kosis particularly resilient and difficult to take down quickly.
• Autoattacks: Kosis has two different melee attacks depending on which arm he uses:
• Right Hand: Applies Corrupted Blood with a square blade and red weapon trail.
• Left Hand: Converts 50% of physical damage to chaos damage with a scimitar and purple weapon trail.
• Fire Flurry: Kosis fires three ground-targeted fireballs from his left hand, each with a 50% chance to ignite the target.
• Lightning Flurry: Kosis releases a zig-zagging beam of lightning from his right hand, which has a 50% chance to shock.
• Fire Combo: Kosis imbues his weapons with elemental energy, slashing with both before throwing them forward, creating a large AoE hit. He then channels eight waves of three fireballs, with the central fireball always igniting the target.
• Lightning Combo: Similar to the Fire Combo, but with lightning. He releases eight bolts of lightning, which deal damage in a small cone and leave behind a Lightning Volatile that explodes on contact, applying shock and a 20% increased damage taken debuff for 2 seconds.
• Demon Beam: Kosis channels a wide black beam that creates a growing Death Zone over 10 seconds. The Death Zone applies Chilling Vision (physical and cold damage over time, with halved movement speed) and Electrifying Sight (physical and lightning damage over time) to those within its area. Fully depleting Kosis’s energy shield while he channels this beam will stun him briefly, interrupting the ability.
• Demon Orb Detonation: Kosis drops onto a Death Zone, triggering up to eight shockwaves based on the Death Zone’s size. These shockwaves ignore obstacles and can trigger other Death Zones to detonate.
• Teleport Attack: Kosis teleports to a distant target, performing a melee attack that creates a small Death Zone at his previous location.

Strategy for Defeating Kosis

To defeat Kosis, players must be prepared for a long and intense fight:

1. Energy Shield Management: Focus on dealing consistent damage to deplete his energy shield. Chaos damage bypass is ineffective, so use high-damage skills that can quickly chip away at his shield.
2. Avoid Ground Effects: Kosis’s abilities create dangerous ground effects, especially the Death Zones. Keep moving to avoid standing in these damaging areas.
3. Interrupt the Demon Beam: If possible, try to deplete his energy shield while he is channeling the Demon Beam to stun him and prevent the creation of a large Death Zone.
4. Stay Mobile: Kosis’s teleport and ranged attacks can catch players off guard. Constant movement will help avoid the most damaging abilities.

2. Omniphobia, Fear Manifest

Omniphobia, Fear Manifest is the second Delirium boss, characterized by his brute strength and heavy physical attacks. Like Kosis, Omniphobia can be encountered in the Simulacrum or in maps influenced by Delirium mirrors or Delirium orbs.

Omniphobia, Fear Manifest

Mechanics and Abilities

Omniphobia’s abilities focus on overwhelming physical damage with some chaos conversion, making him a formidable opponent in close combat.

• Autoattack: A single powerful swing of his two-handed weapon, dealing heavy physical damage.
• Mortar Projectiles: Omniphobia vomits multiple projectiles, with 50% of the physical damage converted to chaos damage. This attack is particularly dangerous due to its area coverage and chaos damage component.
• Wave Slash: Omniphobia releases a long-range wave of energy that deals physical damage. This attack can potentially cause bleeding, though this is unconfirmed.
• Double Slam: A two-hit ground slam that deals significant physical damage.
• Triple Slam: A three-hit ground slam with the final hit having a larger area of effect, capable of hitting multiple targets and dealing massive damage.

Strategy for Defeating Omniphobia

To defeat Omniphobia, players need to be prepared for high physical damage and swift, powerful attacks:

1. Physical Damage Mitigation: Ensure your character has high physical damage reduction and possibly bleeding immunity if Wave Slash is confirmed to cause bleeding. Use skills or flasks that provide additional physical damage reduction or evasion.
2. Avoid Mortar Projectiles: The chaos damage component of the Mortar Projectiles makes them especially dangerous. Stay mobile and try to anticipate where the projectiles will land.
3. Watch for Slams: Omniphobia’s slams can deal devastating damage, especially the Triple Slam. Keep your distance and avoid getting caught in the AoE.
4. Keep Moving: Omniphobia’s attacks are slower but hit very hard. Maintaining constant movement will help you avoid many of his more telegraphed abilities.

Conclusion

Kosis, The Revelation, and Omniphobia, Fear Manifest are two of the most challenging encounters within the Delirium mechanic in Path of Exile. Each boss requires a different strategy to defeat, with Kosis relying on complex mechanics involving energy shields and elemental damage, while Omniphobia focuses on brute physical strength. Successfully overcoming these bosses rewards players with valuable loot and the satisfaction of conquering some of the game’s toughest content. Whether encountered in the Simulacrum or during Delirium-influenced maps, these bosses represent a significant test of a player’s skills and preparedness in Path of Exile.

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