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Harbinger of War Boss Guide

Last Updated: July 9th 2024

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Patch 1.1

The Harbinger's are a series of bosses that must be killed in order to progress The Forgotten Knight Faction and eventually fight Aberroth. Each Timeline has one Harbinger. Harbinger of War is the Harbinger for the Blood, Frost, and Death Timeline. She follows the Agile archetype, which gives her access to the skills of that archetype. She also gains some unique skills from the Frost Lich Formosus, the boss of this Timeline.

In this guide, we cover the rewards, boss mechanics, and provide a strategy for defeating this boss.

For more information on the Harbingers check out our Forgotten Knight Faction Guide.

For more information on the Timeline this boss is found in check out our Blood, Frost, and Death Timeline Guide.



Each Harbinger can drop its own Unique as well as Forgotten Knight Faction rewards.

  • Celestial Doom
  • Harbinger Eye: Used to summon the Pinnacle Boss Aberroth.
  • Harbinger's Needle: When equipped in an Idol slot, this item will allow Empowered Timeline Boss kills to give 3 additional Gaze of Orobyss, significantly speeding up Corruption gains. The item is destroyed when the Timeline Boss is killed.

Boss Mechanics

Each Harbinger has a set of skills according to their archetype (agile or tank) as well as a few skills from the boss of the Timeline Boss.

Archetype -Agile

Creates two portals, one next to the Harbinger and another near the player. After a short delay, the Harbinger thrusts her spear into the nearby portal, causing it to shoot out of the other one. Deals low Physical and Void Damage.

Timeline Boss - Lagon

The Harbinger places several tornado-like DoTs on the ground that slowly move in random directions and deal Cold Damage that gets stronger over time.


When you go into a timeline boss fight, you carry any modifiers that are active from running echoes. Some of these modifiers can be especially dangerous, while some can actually bring value with little or no downside.

Avoid These Modifiers

Take These Modifiers

Boss Strategy

This is a relatively easy fight compared to some other Harbingers.

  • Avoid Spear Beam. It's a well telegraphed attack and therefore unnecessary damage. The same goes for Portal Spear and Void Spears.
  • Most of her other archetypal attacks are difficult to avoid in melee range, but don't deal excessive damage. Either tank it or stay at range.
  • Avoid both Ice Vortex and Spirit Beam. The damage of each is high enough to kill most builds quickly. Spirit Beam is well telegraphed and Ice Vortex moves slowly, so both should be relatively easy to stay out of


  • Harbingers are bosses that are required for progression with the Forgotten Knights Faction.
  • Harbinger of War follows the Agile archetype.
  • She also gains skills based on Frost Lich Formosus
  • The Unique reward for killing this boss is Celestial Doom


Written by McFluffin.
Reviewed by VisionGL.

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