NPCs composing that spawngroup :

#The_Spectre_Sepulcher (25%)

a_bile_golem (25%)

a_sepulcher_skeleton (25%)

greater_war_boned_skeleton (25%)

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

charasis_74, range=183 (244,117,5)

charasis_83, range=179 (264,135,4)

charasis_87, range=134 (26,243,-194)

a_sepulcher_skeleton (100%)

charasis_121, range=196 (12,147,22)

charasis_140, range=57 (131,228,23)

charasis_141, range=14 (143,275,23)

a_bottomless_feaster (100%)

charasis_144, range=90 (157,189,23)

charasis_145, range=122 (79,184,22)

charasis_146, range=168 (-6,320,22)

charasis_147, range=162 (12,353,22)

charasis_148, range=147 (9,273,21)

a_bile_golem (100%)

charasis_149, range=178 (-20,257,22)

charasis_151, range=143 (61,173,22)

charasis_152, range=111 (60,224,21)

charasis_153, range=147 (300,241,-158)

charasis_154, range=123 (280,265,-158)

charasis_157, range=174 (25,165,-194)

a_pyre_golem (50%)
a_pyre_golem (50%)

pulsating_bile_189511, range=163 (239,138,5)