Boss altar · Swamp

Bonemass Altar

5 per world · nearest usually 2,835 m from spawn

The Forsaken altar of Bonemass, a mass of rot and bone. Place ten withered bones on the altar to summon it.

5 are placed per world. They go in the Swamp, away from the biome's edges. Distance from the world centre: beyond 2,000 m. Altitude 0 to 2 m relative to sea level. Never closer than 3,000 m to another of its kind. Placed before ordinary locations, so it takes first pick of zones.

Summoning, the fight and the drops are on the Bonemass page.

BiomeSwamp

KindBoss altar

Per world5

From the centrebeyond 2,000 m

Altitude0 to 2 m

Spacing3,000 m

Footprint20 m radius

Prefab idBonemass

How far from spawnnearest copy, measured over 100,186 generated worlds

Closest seen959 m

1 in 10 worlds, within2,201 m

Typical world2,835 m

9 in 10 worlds, within3,932 m

Present in every world scanned. Straight-line distance from the spawn stones to the nearest copy. Filter worlds by it on the seed finder, or see every copy in your world on the seed map.