NPCs composing that spawngroup :

a_bottomless_feaster (50%)

greater_war_boned_skeleton (50%)

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

charasis_114, range=38 (-42,444,22)

charasis_115, range=113 (7,565,23)

charasis_116, range=89 (7,531,22)

charasis_117, range=183 (-91,657,22)

charasis_122, range=198 (-47,674,23)

charasis_123, range=99 (3,549,21)

a_bile_golem (50%)
a_bile_golem (50%)

charasis_124, range=46 (-62,429,21)

a_bile_golem (50%)
a_sepulcher_skeleton (50%)

charasis_126, range=164 (-141,621,22)

a_sepulcher_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_127, range=119 (-170,532,14)

charasis_128, range=90 (-144,518,3)

a_bile_golem (100%)

charasis_129, range=76 (-116,532,14)

charasis_130, range=160 (-208,549,22)

an_undead_oblation (50%)
greater_war_boned_skeleton (50%)

charasis_133, range=103 (-156,429,22)

charasis_134, range=82 (-132,429,22)

charasis_143, range=95 (-144,423,22)

a_sepulcher_skeleton (100%)

charasis_146, range=166 (-6,320,22)

charasis_147, range=144 (12,353,22)

charasis_205, range=148 (-95,621,23)

a_bottomless_devourer (100%)

charasis_208, range=95 (-127,548,4)

greater_war_boned_skeleton (100%)