NPCs composing that spawngroup :

a_sepulcher_spirit (34%)

elementalbone_skeleton (33%)

hexbone_skeleton (33%)

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

charasis_7, range=82 (117,-458,40)

an_undertaker_skeleton (50%)
a_hamal_skeleton (50%)

charasis_8, range=93 (152,-440,25)

charasis_88, range=69 (135,-600,22)

charasis_90, range=16 (136,-532,22)

charasis_91, range=67 (152,-600,22)

charasis_193, range=98 (80,-600,22)

charasis_194, range=72 (80,-532,22)

charasis_195, range=89 (63,-533,22)