Bonemass Boss Guide: How to Summon and Beat the Third Boss | Valheim

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Valheim - How to Beat Bonemass.png
This is a boss battle guide on how to summon and beat Bonemass, the third boss of Valheim. Read on to find out what you need to summon Bonemass, its attack patterns, and how to beat it!

How To Summon Bonemass

Look for the Skull Altar

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The Skull Altar is located within the Swamp biome in Valheim.

Sacrifice Ten Withered Bones

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Gather ten Withered Bones by exploring Sunken Crypts and hunting Wraiths at the Swamp biome.

Activate the skull altar by placing the Withered Bones in your toolbar and pressing the number associated with its slot.

Bonemass' Attack Patterns


Valheim (Bonemass) - Swipe Attack.png
Bonemass uses one of its massive arms to do frontal swipe, inflicting poison damage over time to anyone it connects with.

It is important to note that the poison damage will push through regardless if you block or parry the attack.

Armpit Bomb

Valheim (Bonemass) - Armpit Bomb Attack.png
Bonemass grabs a ball of goop from one of its armpits and tosses it in a player's general direction, spawning skeletons and blobs on impact.

Poison Cloud

Valheim (Bonemass) - Poison Cloud Attack.png
Bonemass ejects its material within, creating a poison cloud in a large radius. Anyone caught in the cloud suffers high poison damage over time.

Bonemass Strategies

Use Blunt Weapons

Valheim (Bonemass) - Blunt Weapons strategy.png
Bonemass is highly resistance to pierce and slash damage. Blunt weapons such as Maces, Clubs, and Hammers are the most effective against it!

Go Iron or Go Home

Valheim (Bonemass) - Go Iron or Go Home strategy.png
Bonemass' damage can be too much for bronze armor or lower — especially during solo play. It is recommended that you and your allies craft iron scale mails, greaves, and helmets before taking Bonemass on!

Take your time and explore Sunken Crypts in the swamp biomes. These dungeons are excellent sources of Scrap Iron, which is then refined into Iron.

Prepare Potions and Food

Valheim (Bonemass) - Prepare Potions strategy.png
Bonemass' can easily inflict poison damage with its attacks. This can become problematic for you and your allies if left unchecked.

Potions such as the Poison Resist Mead and Medium Health Mead are excellent items to manage Bonemass' insane damage over time!

Sausages can easily take your maximum HP to about 150 when paired with Cooked Meat and Grilled Neck Tails.

Watch its Body Language

Valheim (Bonemass) - Watch its Body Language strategy.png
All of Bonemass' attacks are heavily telegraphed by its arms and head. Refer to the table below for each attack and their respective telegraphs:

Attack Telegraph
Swipe Bonemass will stretch one of its arms out before swiping its front.
Armpit Bomb Bonemass reaches into one of its armpits for a ball of goop.
Poison Cloud Bonemass will raise both arms sideways or stretch its head upward before ejecting a massive poison cloud.

Keep Tabs on its Minions

Valheim (Bonemass) - Keep Tabs on its Minions strategy.png
Bonemass' Armpit Bomb attack summons skeletons and blobs in its impact zone. Make sure you eliminate Bonemass' minions to avoid getting overwhelmed! The Iron Sledge and Stagbreaker are excellent weapons to deal with closely grouped minions.

Build a Base or Portal

Valheim (Bonemass) - Build a Base or Portal strategy.png
It is always recommended to build a small base with beds or a portal to and from your actual base near a boss' summoning altar.

This allows you and your allies to quickly jump back into the fray if things go south!

Valheim Boss Battles

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    • Soap most likely originated from when people cooked food on a spit and the fat dripped on to the white ash in the fire and when combined with water it made a lather. Adding soap could introduce hygiene factors into the game. They could introduce it similar to how the hunger works, like, the better your hygiene, the more health/stamina you can gain. Making soap could consist of cooking meat over the spit, the fat mixing with ash and then mixing it with water could give you soap.

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