NPCs composing that spawngroup :

a_bile_golem (25%)

a_sepulcher_skeleton (25%)

a_sepulcher_spectre (25%)

elementalbone_skeleton (25%)

NPCs spawning around that spawngroup :
(Max range : 200)

charasis_74, range=158 (244,117,5)

charasis_83, range=162 (264,135,4)

charasis_84, range=174 (251,102,4)

charasis_87, range=105 (26,243,-194)

a_sepulcher_skeleton (100%)

charasis_118, range=164 (-12,147,22)

charasis_121, range=143 (12,147,22)

charasis_141, range=48 (143,275,23)

a_bottomless_feaster (100%)

charasis_144, range=46 (157,189,23)

charasis_145, range=68 (79,184,22)

charasis_146, range=165 (-6,320,22)

charasis_147, range=172 (12,353,22)

charasis_148, range=129 (9,273,21)

a_bile_golem (100%)

charasis_149, range=153 (-20,257,22)

charasis_150, range=57 (157,279,22)

charasis_151, range=89 (61,173,22)

charasis_152, range=71 (60,224,21)

charasis_153, range=169 (300,241,-158)

charasis_154, range=153 (280,265,-158)

charasis_157, range=123 (25,165,-194)

a_pyre_golem (50%)
a_pyre_golem (50%)

charasis_158, range=168 (-25,165,-194)

a_pyre_golem (50%)
a_pyre_golem (50%)

charasis_159, range=189 (-2,92,-188)

a_bottomless_gnawer (50%)
greater_war_boned_skeleton (50%)

pulsating_bile_189511, range=140 (239,138,5)