NPCs composing that spawngroup :

Captain_of_the_Guard (10%)

greater_spurbone (90%)

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

citymist_105, range=83 (-241,-474,75)

citymist_143, range=99 (-154,-620,5)

an_apparition (50%)
greater_spurbone (50%)

citymist_144, range=90 (-141,-553,3)

citymist_145, range=36 (-236,-593,3)

Captain_of_the_Guard (10%)
greater_spurbone (90%)

citymist_147, range=81 (-162,-513,5)

citymist_148, range=44 (-235,-513,5)

a_shadow (25%)
greater_spurbone (25%)

citymist_149, range=66 (-230,-623,23)

citymist_150, range=69 (-234,-626,5)

a_shadow (16%)
plaguebone_skeleton (16%)

citymist_151, range=61 (-231,-496,3)

citymist_spectral_courier0_takp_import_v0, range=83 (-161,-512,5)

citymist_223157_takp_import_v0, range=47 (-260,-519,75)

gyrating_goo (100%)

citymist_222977_takp_import_v0, range=83 (-245,-475,75)

citymist_223158_takp_import_v0, range=46 (-261,-522,75)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_222963_takp_import_v0, range=84 (-152,-528,3)

citymist_222961_takp_import_v0, range=68 (-233,-625,3)

citymist_greater_spurbone86_takp_import_v0, range=27 (-219,-532,3)

greater_spurbone (50%)
greater_spurbone (50%)

citymist_222964_takp_import_v0, range=65 (-229,-622,21)

citymist_222962_takp_import_v0, range=99 (-153,-619,5)

citymist_222960_takp_import_v0, range=45 (-234,-512,5)