NPCs composing that spawngroup :

plaguebone_skeleton (25%)

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

citymist_1, range=23 (-117,-416,76)

#A_Terror_Wraith (10%)
greater_war_boned_skeleton (90%)

citymist_77, range=80 (-175,-350,264)

citymist_78, range=71 (-114,-355,261)

citymist_79, range=80 (-146,-342,263)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_101, range=41 (-120,-459,75)

citymist_137, range=87 (-225,-438,5)

citymist_139, range=37 (-136,-385,4)

a_shadow (16%)
greater_spurbone (16%)

citymist_140, range=71 (-134,-351,4)

plaguebone_skeleton (25%)

citymist_147, range=93 (-162,-513,5)

citymist_152, range=72 (-100,-483,4)

citymist_153, range=84 (-97,-349,4)

a_haze_golem (33%)
a_lost_one (33%)

citymist_156, range=55 (-188,-395,4)

a_shadow (25%)
greater_spurbone (25%)

citymist_165, range=87 (-54,-400,10)

a_haze_golem (50%)
a_lost_one (50%)

citymista_War_Bone_Overlord00035094065, range=89 (-215,-374,20)

a_War_Bone_Overlord (10%)
greater_spurbone (90%)

citymist_spectral_courier0_takp_import_v0, range=92 (-161,-512,5)

citymist_223157_takp_import_v0, range=81 (-150,-341,263)

gyrating_goo (100%)

citymist_222977_takp_import_v0, range=40 (-115,-454,75)

citymist_223158_takp_import_v0, range=44 (-115,-460,75)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_222958_takp_import_v0, range=97 (-224,-374,5)

citymist_222956_takp_import_v0, range=12 (-144,-433,5)

citymist_222955_takp_import_v0, range=1 (-138,-421,5)

citymist_plaguebone_skeleton93_takp_import_v0, range=98 (-42,-440,3)