NPCs composing that spawngroup :

a_helot_skeleton (25%)

a_sepulcher_skeleton (25%)

elementalbone_skeleton (25%)

hexbone_skeleton (25%)

NPCs spawning around that spawngroup :
(Max range : 100)

charasis_5, range=73 (-513,-274,4)

hexbone_skeleton (100%)

charasis_41, range=84 (-567,-296,4)

a_bottomless_devourer (50%)
a_helot_skeleton (50%)

charasis_43, range=26 (-579,-212,4)

charasis_44, range=99 (-652,-226,4)

an_undertaker_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_56, range=95 (-566,-117,4)

a_helot_skeleton (100%)

charasis_107, range=86 (-479,-168,5)

charasis_171, range=76 (-576,-139,3)