Withered bone is a forsaken offering item in Valheim. Its in-game item ID is WitheredBone, which you can drop into the console with spawn WitheredBone to give yourself one — append a number like spawn WitheredBone 50 to spawn a stack. A giant bone, knotted like old wood. The spawn command requires cheats — enable them with devcommands after opening the console.
Spawns one Withered bone at your location.
Spawns one Withered bone at your location.
Spawns five Withered bone at your location.
Spawns twenty Withered bone at your location.
A giant bone, knotted like old wood.
Withered bones are dropped by Draugrs in the Swamp and found inside Sunken Crypts. Ten Withered bones are required to summon Bonemass, the third boss, on his Forsaken Altar.