Path of Exile 2 (PoE 2)

Kosis, the Revelation Boss Guide

Path of Exile 2 (PoE 2) Walkthrough Team

Last updated on: April 30, 2025 05:59 AM

Path of Exile 2 (PoE 2) - Kosis, the Revelation Boss Guide

Kosis, the Revelation is an Atlas Pinnacle Boss in Path of Exile 2 (PoE 2). See the location, the drops or rewards, and tips on how to beat Kosis, the Revelation here.

List of Contents

Location
How to Beat
Rewards
Overview
Related Guides

Kosis, the Revelation Location

Atlas - Delirium and Simulacrum

Path of Exile 2 - Kosis, the Revelation Location

Kosis, the Revelation may randomly spawn in Delirium maps or in higher waves during a Simulacrum at a Realmgate, with a guaranteed chance to spawn during the last few waves.

Additionally, while unconfirmed, being more delirious may increase the chances of bosses spawning during Delirium maps.

Delirium Guide

How to Beat Kosis, the Revelation

Tips on Beating Kosis, the Revelation
Avoid and Interrupt its Ice Beam Avoid Ice Orbs and Teleporation Attack Stay Near Kosis, But Avoid Its Melee Attacks

Avoid and Interrupt its Ice Beam Attack

Players should make sure to avoid Kosis' Ice Beam. This attack does high DoT, and getting caught in it slows and freezes players, likely killing them. Players can dodge the attack by getting out of its line of sight after it screams, curls up, and absorbs cold energy.

Deplete His Energy Shield During the Attack

Additionally, once the attack starts, players should interrupt it as soon as possible by depleting Kosis' energy shield. The beam creates Ice Orbs at its targeted area, and the longer Kosis fires the beam, the larger these orbs will be. This puts the player in danger of later attacks.

Avoid Ice Orbs and Teleporation Slam Attack

Players should avoid any nearby Ice Orbs. Kosis can create or leave behind Ice Orbs through his Ice Beam or teleportation ability. Getting near these orbs deals DoT to players and chills them, making them dangerous.

Kosis also has an attack wherein it teleports into and slams the Ice Orb nearest the player to release devastating waves of ice spikes from the ground. The larger the Ice Orb, the more range and power these ice spikes will have.

Teleportation Slam Can Detonate Multiple Ice Orbs

Additionally, the initial slam can also detonate multiple Ice Orbs, as long as they are within the slam's AoE. As such, players should not let these Ice Orbs accumulate by moving away from Kosis, triggering its teleportation attack, and effectively detonating Ice Orbs in a controlled and safe manner.

Stay Near Kosis, But Avoid Its Melee Attacks

Players should stick relatively near Kosis, as going away from it triggers some of its most devastating attacks, like its teleportation attack that deal increased damage. The attacks he executes while players are in close range are more easily managed and dodgeable.

However, players should be extra careful not to get hit by Kosis' melee attacks, as they inflict Corrupting Blood, dealing considerable physical DoT.

Kosis, the Revelation Rewards

First Time Clear Rewards

・Deranging Book of Knowledge

The first time you clear the final wave of the Simulacrum in each difficulty tier by defeating Kosis or Omniphobia, they will drop a Deranging Book of Knowledge. Using this item grants two Delirium Atlas Passive Points.

Atlas Skill Tree Guide

Exclusive Unique Drops

Unique Drops
Perfidy Knight Armour	Strugglescream Stellar Amulet
Collapsing Horizon Wyrm Quarterstaff	Assailum Closed Helm
Melting Maelstrom Ultimate Mana Flask	Megalomaniac Diamond

Defeating Kosis or Omniphobia in Wave 15 of the Simulacrum rewards players with one of several possible Unique items. Some of these Uniques have lower drop rates than others, and increasing the difficulty affects both the item pool and drop chances.

List of Unique Equipment

Kosis, the Revelation Overview

Basic Info


Location	Atlas Delirium
Resistances	・ Fire ・ Cold ・ Lightning
Weaknesses	・ None
Damage Types	・ Physical ・ Chaos ・ Fire ・ Lightning
Debuffs	・ Chill ・ Ignite ・ Shock ・ Corrupted Blood

Path of Exile 2 (PoE 2) Related Guides

Path of Exile 2 - All Bosses Partial Banner
List of Bosses

All Boss Guides
All Pinnacle Bosses	All Spirit Bosses

All Act 1 Bosses

The Bloated Miller	The Devourer	Beira of the Rotten Pack
Areagne, Forgotten Witch	The Brambleghast	The Rust King
The Rotten Druid	Draven, the Eternal Praetor	Asinia, Praetor Consort
Lachlan of Endless Lament	The King in the Mists	The Crowbell
Vargir the Feral Mutt	The Executioner	Candlemass, the Living Rite
Count Geonor	-	-

All Act 2 Bosses

Rathbreaker	Rudja, Dread Engineer	Balbala, The Traitor
L'im the Impaler	Jamanra, the Risen King	Kabala, Constrictor Queen
Zalmarath, the Colossus	Tor Gul, the Defiler	Ekbab, Ancient Steed
The Ninth Treasure of Keth	Azarian, the Forsaken Son	Watchful Twins
Jamanra, the Abomination	Sisters of Garukhan	-

All Act 3 Bosses

Rootdredge	Mighty Silverfist	Blackjaw, the Remnant
Xyclucian, the Chimera	Zicoatl, Warden of the Core	Ignagduk, the Bog Witch
Mektul, the Forgemaster	Queen of Filth	Ketzuli, High Priest of the Sun
Viper Napuatzi	Doryani	-

All Interlude Bosses

Akthl and Anundr	Isolde and Heldra	Siora, Blade of the Mists
Sigbert and Godwin	Oswin, the Dread Warden	Thane Wulfric and Lady Elswyth
Vornas, the Fell Flame	Lythara, the Wayward Spear	Rakkar, the Frozen Talon
The Abominable Yeti	Stormgore, the Guardian	Zolin and Zelina

Abyss Bosses

Tasgul, Swallower of Light

Vandroth, Blackblooded Enslaver

Vessel of Kulemak

Trial Bosses

Bahlak, the Sky Seer	Uxmal, the Beastlord	Chetza, the Feathered Plague
Rattlecage, the Earthbreaker	Terracota Sentinels	Ashar, the Sand Mother

Pinnacle Bosses

Zarokh, the Temporal	Xesht, We That Are One	The Arbiter of Ash
The Trialmaster	Kosis, the Revelation	Omniphobia, Fear Manifest

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