Bonemass2 starsspawn Bonemass 1 3How to summon
Offer 
10× Withered Bone at the Boiling Death in Bonemass.
Forsaken power from its trophy: Bonemass · 5 min
The mass takes the brunt of your blows. The effort required to raise your shield lessens, and you can withstand harder hits.
- Block stamina -100%
- Slightly resistant to Blunt
- Slightly resistant to Slash
- Slightly resistant to Pierce
Drops
| Item | 0★ | 1★ | 2★ | Chance |
|---|---|---|---|---|
| Bonemass Trophy | 1 | 1 | 1 | 100% |
 Wishbone | 1 each | 1 each | 1 each | 100% |
From CharacterDrop in the files. Stars multiply chance and amount of the drops marked for it by 2 per star. Amounts are what the game can roll (it never rolls the upper number written in the files). Chances of 30% or less use a pseudo-random counter, so long dry streaks can't happen.
Attacks
| Attack | Damage | Every |
|---|---|---|
| Attack aoeranged | 130 Poison | 30 s |
| Attack punchmelee | 80 Blunt1,000 Chop1,000 Pickaxe50 Poison | 7 s |
Each star adds 50% damage (Attack.GetLevelDamageFactor). Check what your shield can hold in the block calculator.
Achievements
BonemassDefeat the Writhing Dead.
The Tough VikingDefeat all bosses on normal difficulty or higher.
The Toughest VikingDefeat all bosses on hard difficulty.
The VikingDefeat all bosses on any difficulty.Bonemass in other languages
SwedishLikhögen
UkrainianКістянка
Portuguese BrazilianMassa Óssea
DanishKnoglemasse
NorwegianBeinmassen
HungarianCsonttömeg
FrenchMasse-d'Os
GermanKnochenwanst
SpanishTuétano
RussianМасса костей
BulgarianКостна Грамада
FinnishLuumassa
IcelandicBeinhrúga
TurkishKemik yığını
LithuanianKaulų masė
PolishKościoszlam
DutchBottenmassa
Portuguese EuropeanMassa Óssea
Chinese邪骨恶灵
Chinese Trad千骸骨魔
Japanese大骨
Korean본매스
Thaiโบนแมส
Georgianძვლების გროვა
LatvianPurvbriesmonis
From the game's own localization files (26 languages).
Source: prefab Bonemass (Character, CharacterDrop, spawn lists) in Valheim 1.0.16 (2026-09-24).