NPCs composing that spawngroup :

an_undertaker_skeleton (33%)

a_sepulcher_spirit (34%)

elementalbone_skeleton (33%)

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

charasis_16, range=68 (27,-543,23)

a_helot_spectre (100%)

charasis_17, range=89 (26,-520,23)

a_helot_spectre (50%)
hexbone_skeleton (50%)

charasis_88, range=70 (135,-600,22)

charasis_90, range=98 (136,-532,22)

charasis_91, range=87 (152,-600,22)

charasis_193, range=15 (80,-600,22)

charasis_194, range=69 (80,-532,22)

charasis_195, range=67 (63,-533,22)