Like all Valheim bosses, Bonemass will only turn up to fight you when you summon it from its altar. Bonemass's altar is in the Swamp area, which you should have explored thoroughly following your ...

Like other Valheim bosses, you can only summon Bonemass at specific altars. To find the location of such an altar, you'll need to interact with rune stones located in the Swamps. These are found ...

Each biome in Valheim has one boss to find, and can be located by looking for a runestone - which will mark on your map the boss location - or by exploring until you find the boss altar itself.

As with every boss you must summon, your first task will be finding Bonemass’ Sacrificial Altar and summoning materials. You're not on your own, though, because our Valheim Bonemass guide gives ...

Like other Valheim bosses, you can only summon Bonemass at specific altars. To find the location of such an altar, you'll need to interact with rune stones located in the Swamps. These are found ...