NPCs composing that spawngroup :

a_haze_golem (18%)

plaguebone_skeleton (18%)

plaguebone_skeleton (18%)

spectral_courier (10%)

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

citymist_101, range=67 (-120,-459,75)

citymist_102, range=69 (-116,-566,75)

citymist_105, range=88 (-241,-474,75)

citymist_137, range=97 (-225,-438,5)

citymist_141, range=92 (-139,-422,5)

plaguebone_skeleton (25%)

citymist_142, range=83 (-231,-557,3)

Captain_of_the_Guard (10%)
greater_spurbone (90%)

citymist_144, range=45 (-141,-553,3)

citymist_146, range=85 (-138,-594,3)

an_apparition (100%)

citymist_147, range=1 (-162,-513,5)

citymist_148, range=74 (-235,-513,5)

a_shadow (25%)
greater_spurbone (25%)

citymist_151, range=71 (-231,-496,3)

citymist_152, range=67 (-100,-483,4)

citymist_162, range=94 (-100,-584,22)

citymist_223157_takp_import_v0, range=99 (-260,-519,75)

gyrating_goo (100%)

citymist_222977_takp_import_v0, range=91 (-245,-475,75)

citymist_223158_takp_import_v0, range=69 (-115,-460,75)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_222963_takp_import_v0, range=18 (-152,-528,3)

citymist_greater_spurbone86_takp_import_v0, range=61 (-219,-532,3)

greater_spurbone (50%)
greater_spurbone (50%)

citymist_222960_takp_import_v0, range=73 (-234,-512,5)

citymist_222958_takp_import_v0, range=85 (-95,-566,23)

citymist_222956_takp_import_v0, range=80 (-144,-433,5)

citymist_222955_takp_import_v0, range=93 (-138,-421,5)