NPCs composing that spawngroup :

a_haze_golem (50%)

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

citymist_80, range=52 (29,-344,255)

#Gyrating_Green_Slime (10%)
gyrating_goo (90%)

citymist_82, range=68 (-37,-329,257)

citymist_83, range=89 (77,-343,256)

greater_war_boned_skeleton (100%)

citymist_138, range=68 (64,-412,10)

citymist_165, range=55 (-54,-400,10)

a_haze_golem (50%)
a_lost_one (50%)

citymist_223158_takp_import_v0, range=87 (61,-324,75)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_222958_takp_import_v0, range=64 (64,-382,11)

citymist_222955_takp_import_v0, range=50 (48,-370,3)

citymist_plaguebone_skeleton93_takp_import_v0, range=67 (-42,-440,3)