NPCs composing that spawngroup :

greater_war_boned_skeleton (100%)

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

charasis_114, range=134 (-42,444,22)

charasis_115, range=135 (7,565,23)

charasis_116, range=135 (7,531,22)

charasis_117, range=114 (-91,657,22)

charasis_119, range=132 (-90,675,23)

charasis_120, range=148 (-91,692,22)

charasis_122, range=149 (-47,674,23)

charasis_123, range=130 (3,549,21)

a_bile_golem (50%)
a_bile_golem (50%)

charasis_124, range=134 (-62,429,21)

a_bile_golem (50%)
a_sepulcher_skeleton (50%)

charasis_125, range=96 (-64,476,22)

a_bottomless_feaster (50%)
greater_war_boned_skeleton (50%)

charasis_126, range=74 (-141,621,22)

a_sepulcher_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_127, range=45 (-170,532,14)

charasis_128, range=33 (-144,518,3)

a_bile_golem (100%)

charasis_129, range=19 (-116,532,14)

charasis_130, range=80 (-208,549,22)

an_undead_oblation (50%)
greater_war_boned_skeleton (50%)

charasis_133, range=122 (-156,429,22)

charasis_134, range=119 (-132,429,22)

charasis_143, range=125 (-144,423,22)

a_sepulcher_skeleton (100%)

charasis_205, range=80 (-95,621,23)

a_bottomless_devourer (100%)