NPCs composing that spawngroup :

a_War_Bone_Overlord (10%)

greater_spurbone (90%)

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

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

citymist_79, range=76 (-146,-342,263)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_108, range=55 (-202,-320,76)

citymist_109, range=86 (-231,-289,76)

citymist_135, range=33 (-242,-354,5)

citymist_136, range=34 (-245,-391,4)

citymist_137, range=64 (-225,-438,5)

citymist_139, range=79 (-136,-385,4)

a_shadow (16%)
greater_spurbone (16%)

citymist_140, range=84 (-134,-351,4)

plaguebone_skeleton (25%)

citymist_141, range=89 (-139,-422,5)

plaguebone_skeleton (25%)

citymist_156, range=34 (-188,-395,4)

a_shadow (25%)
greater_spurbone (25%)

citymist_spectral_courier0_takp_import_v0, range=63 (-224,-437,4)

citymist_223157_takp_import_v0, range=72 (-150,-341,263)

gyrating_goo (100%)
gyrating_goo (100%)

citymist_222977_takp_import_v0, range=56 (-201,-319,77)

citymist_223450_takp_import_v0, range=93 (-170,-292,76)

citymist_222966_takp_import_v0, range=33 (-241,-353,5)

citymist_222958_takp_import_v0, range=9 (-224,-374,5)

citymist_222956_takp_import_v0, range=92 (-144,-433,5)

citymist_222955_takp_import_v0, range=90 (-138,-421,5)