In Last Epoch, Harbingers are challenging endgame bosses tied to the Monolith of Fate timelines and the Forgotten Knight faction questline. To find and fight Harbingers, players must progress through level 90 empowered timelines and defeat timeline bosses at increasing corruption levels, which unlocks the Harbinger encounters Last Epoch Gold.

How to Find Harbingers
Harbingers first appear after you complete the campaign and start running empowered Monolith timelines at level 90. After defeating a timeline boss at the required corruption level-starting at 100 corruption and increasing by increments of 25 for each subsequent Harbinger-a Harbinger will spawn immediately. You can choose any timeline to fight the Harbingers in any order, but each timeline has one unique Harbinger, totaling 10 to defeat. After killing a Harbinger, you are teleported to the Shattered Road, the Forgotten Knights faction hub, where you complete a short quest and track your progress.

Corruption is a key mechanic: higher corruption means tougher enemies but is necessary to spawn Harbingers. Normal Monoliths cap at 50 corruption, so you must run empowered versions to reach the required corruption levels. You can raise corruption by completing monoliths, using Glyphs of Envy, and progressing through timelines.

Fighting Harbingers
Harbingers are formidable foes that combine their own archetype abilities with some of the timeline boss’s powers. They typically deal heavy void damage and use combo attacks, including teleportation to close distance rapidly. For example, the Harbinger of Hatred (from The Black Sun timeline) uses tank archetype moves such as ground slams, void orbs, and rush attacks, combined with void meteors and flares from the timeline boss Rahyeh.

Some common tactics for fighting Harbingers include:
1. Mobility: Harbingers hunt the player aggressively and will stop their attack patterns to chase you, so use movement and teleportation skills to reposition and avoid damage.
2. Avoid telegraphed attacks: Many Harbinger attacks have clear visual cues, such as red cones or circles on the ground. Dodging these is crucial buy Last Epoch Gold.
3. Manage adds and echoes: Some Harbingers summon echoes or additional enemies that slam the ground or fire projectiles. Positioning yourself between these attacks can reduce damage taken.
4. Focus priority targets: In some fights, killing specific adds or worms first reduces incoming damage and makes the fight more manageable.