Blood Frost and Death Formosus the Undying Guide
Learn how to defeat Formosus the Undying in Last Epoch. Our Formosus the Undying guide covers everything including a complete guide on Formosus the Undying combat mechanics, the recommended defensive stats, unique rewards, and the Timeline's Harbinger.
Blood, Frost, and Death - Formosus the Undying Boss Guide
Formosus the Undying, also known as Frost Lich Formosus, is the final boss of the Blood, Frost, and Death Monolith Timeline in Last Epoch. The fight takes place in the Layer of Formosus arena and features a single-phase battle focused on cold and necrotic damage. The fight can quickly become chaotic due to all the undead that will be summoned.
Boss Mechanics
Here is a detailed breakdown of the major mechanics and abilities used by Formosus.
Undead Summons
Formosus will summon three Undead Wengari Axe Throwers and one Undead Wengari Matriarch. Be particularly careful with the Matriarch as she will do a massive Earthquake attack accompanied by a big aftershock, dealing both Physical and Lightning damage. If you kill any of the Wengari, they will get resurrected eventually.
Necrotic beam
Formosus will launch a massive beam right in front of him. The beam deal Necrotic damage and DoT Necrotic damage. The longer it lasts, the more damage it will do.
Frost Tornado
Formosus will summon small frost tornadoes. They move in random directions, but are quite slow, making them easy to avoid. They stay quite long in the arena and deal Cold damage if you get hit.
Seekers
Formosus will shoot out Cold and Necrotic missiles that seek the player. They are quite hard to evade as they seek you for a long time. However, they do not deal a ton of damage; getting hit by them likely won't be detrimental.
Ice Path and Teleport
Formosus has two attacks that do not deal damage. He sometimes teleports to another location. It can happen that he teleports off-screen, so don’t be surprised if you suddenly don’t see him anymore. He can also leave an ice trail on the ground, slowing you down if you walk on it. Both deal no damage, but are just a bit annoying.
Encounter Walkthrough & Strategy
The fight is really one of the easiest. He has no massive mechanic that can actually one-shot you. Most of his attacks can be tanked, even if you get hit. Just be careful of the Cold and Necrotic damage over time.
Recommended Defensive Stats.
- 75% Cold Resistance
- 75% Necrotic Resistance
- 75% Lightning Resistance
- 75% Physical Resistance
- High movement speed is extremely helpful
Unique Boss-Specific Rewards
Formosus can drop four unique items and one Set item depending on the difficulty and corruption level:
Last Steps of the Living and Frozen Eyes of Formosus are both common unique drops with a 50% drop chance each. However, they are mutually exclusive—only one will drop per kill. These can appear in both Normal and Empowered timelines, and their drop rates are not affected by Corruption.
Frostbite Shackles is a rare drop that can technically appear in Normal timelines, but its chances are significantly better in Empowered Monoliths with high Corruption.
Eulogy of Blood is exclusive to Empowered difficulty and is considered a rare drop. Its chance also improves with higher Corruption levels.
Lich's Scorn is the set item that can drop in both Normal and Empowered Monolith, and at any Corruption level.
Monolith Blessings Available
Normal Monoliths | Empowered Monoliths |
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Harbinger of War
The Harbinger for this Timeline if the Harbinger of War. She will keep some skills from Formosus:
- She will keep spawning the Ice Tornadoes. They are still as slow as before, so not very hard to avoid.
- She will channel the necrotic beam in front of him that deals Necrotic damage. You will see the trail on the ground before it launches, giving you enough time to move out of range.
Harbinger Unique Drops
- Celestial Doom
- Harbinger's Needle
Additionally, Harbingers drop the Harbinger Eye which is needed if you want to summon Aberroth.
Changelog
- 26 Mar. 2025: Guide added.


Jay is a long time Hoyoverse player in both Genshin and Honkai Star Rail, enjoying the exploration, lore, challenges, and theorycrafting for his favorite characters. Next to creating guides, he is also an avid fan of editing videos, and you can watch him stream on Twitch
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