NPCs composing that spawngroup :

greater_spurbone (25%)

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

citymist_1, range=74 (-117,-416,76)

#A_Terror_Wraith (10%)
greater_war_boned_skeleton (90%)

citymist_77, range=46 (-175,-350,264)

citymist_78, range=84 (-114,-355,261)

citymist_79, range=68 (-146,-342,263)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_101, range=93 (-120,-459,75)

citymist_105, range=95 (-241,-474,75)

citymist_108, range=76 (-202,-320,76)

citymist_135, range=67 (-242,-354,5)

citymist_136, range=57 (-245,-391,4)

citymist_137, range=56 (-225,-438,5)

citymist_139, range=52 (-136,-385,4)

a_shadow (16%)
greater_spurbone (16%)

citymist_140, range=69 (-134,-351,4)

plaguebone_skeleton (25%)

citymist_141, range=55 (-139,-422,5)

plaguebone_skeleton (25%)

citymista_War_Bone_Overlord00035094065, range=34 (-215,-374,20)

a_War_Bone_Overlord (10%)
greater_spurbone (90%)

citymist_spectral_courier0_takp_import_v0, range=55 (-224,-437,4)

citymist_223157_takp_import_v0, range=66 (-150,-341,263)

gyrating_goo (100%)
gyrating_goo (100%)

citymist_222977_takp_import_v0, range=98 (-245,-475,75)

citymist_223158_takp_import_v0, range=97 (-115,-460,75)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_222966_takp_import_v0, range=67 (-241,-353,5)

citymist_222958_takp_import_v0, range=41 (-224,-374,5)

citymist_222956_takp_import_v0, range=58 (-144,-433,5)

citymist_222955_takp_import_v0, range=56 (-138,-421,5)