NPCs composing that spawngroup :

greater_plaguebone (25%)

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

citymist_56, range=53 (262,-334,-14)

greater_war_boned_skeleton (33%)
greater_war_boned_skeleton (34%)

citymist_59, range=33 (262,-354,39)

citymist_60, range=55 (225,-426,39)

a_fog_golem (33%)
a_lost_one (33%)

citymist_62, range=54 (227,-348,-14)

a_shadow (34%)
plaguebone_skeleton (33%)

citymist_88, range=66 (199,-396,275)

citymist_94, range=62 (249,-327,77)

citymist_116, range=83 (182,-378,65)

citymist_117, range=62 (214,-349,64)

citymist_125, range=19 (259,-369,255)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_127, range=74 (219,-328,274)

citymist_128, range=98 (189,-325,274)

citymist_223157_takp_import_v0, range=54 (260,-333,240)

gyrating_goo (100%)
gyrating_goo (100%)

citymist_222986_takp_import_v0, range=75 (219,-327,273)

citymist_222984_takp_import_v0, range=55 (210,-389,274)

citymist_a_mist_golem7_takp_import_v0, range=96 (211,-307,274)

a_mist_golem (100%)

citymist_222988_takp_import_v0, range=98 (189,-324,274)

a_fog_golem (50%)
greater_war_boned_skeleton (50%)

citymist_222985_takp_import_v0, range=66 (199,-395,273)

citymist_222982_takp_import_v0, range=58 (258,-329,77)

a_mist_golem (50%)
a_phantom (25%)
a_phantom (25%)

citymist_222970_takp_import_v0, range=63 (249,-326,75)

citymist_a_phantom39_takp_import_v0, range=90 (182,-350,65)

a_phantom (50%)
a_phantom (50%)

citymist_223158_takp_import_v0, range=41 (279,-348,75)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_222963_takp_import_v0, range=53 (226,-424,4)

citymist_222971_takp_import_v0, range=76 (198,-424,4)

citymist_222961_takp_import_v0, range=43 (243,-349,-15)

citymist_222968_takp_import_v0, range=55 (225,-425,41)

citymist_222966_takp_import_v0, range=31 (242,-365,41)

citymist_greater_spurbone86_takp_import_v0, range=9 (262,-378,39)

greater_spurbone (50%)
greater_spurbone (50%)

citymist_222972_takp_import_v0, range=90 (182,-350,63)

citymist_222969_takp_import_v0, range=85 (198,-334,-11)