Bonemass

By Valheim Wiki Editorial Team · Published October 14, 2026 · Last updated October 14, 2026

The third Forsaken boss and the first major difficulty spike. Bonemass summons skeletons and oozes while punishing slow movement with poison and heavy melee attacks.

A mass of rot and bone rising from the Swamp, Bonemass is the test that separates careful Vikings from reckless ones.

Valheim Wiki
Boss order
3 of 8
Biome
Swamp
Recommended gear
Iron armor, Iron Mace, Poison Resistance Mead
Main threat
Poison and adds
Best damage
Blunt weapons

How to Summon Bonemass

Collect ten Withered Bones from Swamp Crypts, then offer them at the Bonemass altar. The fight is much harder than the previous two bosses, so prepare Poison Resistance Mead, a good blunt weapon, and a clear escape route.

Fight Strategy

Bonemass is weak to blunt damage and resistant to most other types. An Iron Mace or Sledgehammer is the best choice. The boss regularly summons skeletons and oozes; clear them quickly or you will lose control of the arena.

Poison is the main threat. Drink Poison Resistance Mead before the fight and again when it wears off. Keep your stamina high, dodge the slam attack, and use the summoning animation to land free hits.

Rewards

Defeating Bonemass drops the Wishbone and unlocks the Bonemass power. The Wishbone helps you locate buried Silver in the Mountains, which is essential for the next biome.

Common Mistakes

  • Using slash or pierce weapons instead of blunt damage.
  • Fighting without Poison Resistance Mead.
  • Ignoring adds until they overwhelm you.
  • Starting the fight without a portal or bed nearby.

Tips

  • Use an Iron Mace or Sledgehammer for maximum damage.
  • Drink Poison Resistance Mead before the fight.
  • Clear the surrounding Crypts first to reduce add pressure.
  • Keep a stamina potion ready for emergency dodges.

More Bosses