The Harbinger of Hatred is a challenging endgame boss in Last Epoch, found in the Harbinger's Den within Mephisto's domain in the jungle of Nahantu. To summon this boss, players must first defeat Rahyeh, the final boss of The Black Sun timeline, and then acquire four Abhorrent Hearts from Urivar in the Fields of Judgement Last Epoch Gold. The Harbinger is a tank archetype boss that combines heavy physical attacks with devastating void damage, making it a tough fight requiring careful strategy.

Key Abilities and How to Counter Them
- Devastating Crunch: The Harbinger lunges forward with a powerful bite attack. Watch for the animation and move to its side to avoid damage.
- Mephisto's Corruption: Large circles appear on the ground that explode after a short delay, leaving damaging void zones. Use mobility skills or run out of these zones quickly to avoid damage.
- Corrupted Barrage: The boss prepares a frontal fire and corruption attack. When fire appears in its mouth, move to the sides or behind the boss to evade the attack.
- Orbs of Hatred: The Harbinger summons orbs that turn into projectiles targeting the player. These projectiles are slow, allowing you to dodge them.
- Hateful Lunge: The boss lunges from a portal, dealing heavy damage in a straight path. Move out of the attack path quickly.
- Tank Slam and Massive Tank Slam: Hammer slams that deal physical damage in a cone or targeted area. Circle around or dodge out of the red-marked zones to avoid damage.
- Tank Echo Slam: The boss and echoes strike the ground in succession, sending damaging bursts in lines. Avoid the circles and attack from behind.
- Tank Void Turrets and Portal Blast: Summon projectiles and portal attacks that restrict mobility. Stay mobile and dodge as soon as portals or turrets appear.

Environmental Hazards
At every 25% health threshold, the Harbinger summons kin from gateways who charge at the player and can kill instantly on contact. Avoid their paths and use nearby powers, such as those left by Akarat, to destroy these gateways quickly.

Preparation Tips
- Use an Elixir of Shadow Resistance II from the Alchemist to mitigate shadow damage.
- Maintain high mobility to dodge the boss’s telegraphed attacks and environmental hazards.
- Focus on positioning to avoid frontal cone attacks and incoming projectiles.
- Be aware that the boss’s attacks combine physical and void damage, so balancing resistances is crucial.

Rewards
Defeating the Harbinger of Hatred progresses the Forgotten Knight faction and unlocks access to the pinnacle boss Aberroth. It also offers a chance to drop unique endgame items, including the coveted World Splitter weapon, which is particularly effective for Void Knight builds Last Epoch Gold for sale.