Bonemass

Bonemass
Wanderer, look to your feet, that tread upon our tomb. One thousand bones without their meat, will drag you to your doom.
Trophy	Bonemass trophy
Internal ID	Bonemass
Type	Boss
Details
Faction	Boss
Main biome	Swamp
Tameable	No
Drops	Bonemass trophy Wishbone Bonemass Power
Stats
Health 0★	5000
Health 0★	5000
Damage 0★	80 Blunt, 50 Poison, 1000 Chop, 1000 Pickaxe 130 Poison
Damage 0★	80 Blunt, 50 Poison, 1000 Chop, 1000 Pickaxe 130 Poison
Abilities	Melee AoE (unblockable) Spawn
Resistances
Weak (1.5x)	Blunt, Frost
Resistant (0.5x)	Slash
Very resistant (0.25x)	Fire, Pierce
Immune (0x)	Poison, Stagger

Bonemass is the third boss of Valheim. It appears as a gigantic humanoid mass comprised of toxic ooze, mud and skeletal remains, likely absorbed from nearby tombs situated close to its altar.

Summoning

Bonemass' Forsaken Altar.

Bonemass' Forsaken altar is located in Swamps. Its location can be found when visiting Sunken Crypts and sometimes ruined structures, where a Vegvisir will reveal its nearest summoning location on the map.

It is summoned by placing 10  Withered bones in its Forsaken altar in Swamps. Like all bosses, Bonemass can be summoned as many times as desired, provided the required materials are met.  

Attacks and abilities

For strategies for defeating Bonemass, see Boss Strategies § Bonemass.

Bonemass has an environment aura that forces raining, which means pulling it from the area cannot be used to remove Wet.

Melee

A close-range swipe at a player dealing up to 80 Blunt and 30 Poison damage to players, and 1000 Chop and 1000 Pickaxe damage to any trees or rocks hit.

Area of effect

Bonemass will charge up with a thick green cloud before releasing a wave of poisonous ooze, poisoning everything in a wide range around it (100 Poison damage). This is signaled when it leans backwards. The poison cloud persists for several seconds and will continuously refresh the poison duration on any player that stays inside.

Spawn

At intervals, Bonemass will reach into its armpit to throw out a glob of goop. This is never directed at a player, and will spawn up to four random monsters (skeletons and/or blobs) where it lands. No more of a creature type will be spawned once eight of that type are already present.

Aftermath

Defeating Bonemass provides the player with a Wishbone, which allows the player to easily locate silver deposits beneath the surface of Mountain biomes (as well as buried muddy scrap piles in Swamp biomes, and other miscellaneous buried treasures in certain locations).

Drops

Item	0 Star
Bonemass trophy	1
Wishbone	1 per player

Forsaken power

Mounting Bonemass' trophy upon its respective stone will allow the player to claim its Forsaken Power. This ability will grant the player and nearby allies 50% resistance to Blunt, Slash and Pierce damage types for five minutes.

See Bonemass' power for more details.

Events

Defeating Bonemass affects the following events for that world:

• Disables: Draugr and Skeleton "A foul smell from the swamp..."
• Enables: Blobs and Oozers "A foul smell from the swamp..."
• Enables: "A skeleton surprise!"
• Enables: "A cold wind blows from the mountains." (if Moder has not been defeated)
• Enables: "There's a smell of sulfur in the air." (if a Surtling has died)
• Enables: "You are being hunted."
• Enables: "You stirred the cauldron." (if a Bat has died)

Note: Two of these events unlock flying enemies that will be uninhibited by base walls and will attack tame animals. For example, bats will quickly wipe out any outdoor tame boars (if the player has them), most likely before the player can swat them all. Therefore, in order to protect any rare animals (such as a 2-star Boar), it is advisable to build a secure indoor barn area before undertaking Bonemass.

Creature spawning

Defeating Bonemass unlocks skeletons to spawn at night in the Meadows, Black Forest, Swamp (additional), Mountain and Plains. They can only have 0 stars.

Gallery

Bonemass 0.153.2 Model

Bonemass and Yagluth chatting

Notes

• Bonemass has undergone a model change since Valheim's release.
• In the in-game trophies menu, there is another description of Bonemass, "A mess of black soil and old bone, thankfully quiet now."