NPCs composing that spawngroup :

a_fog_golem (50%)

greater_plaguebone (25%)

greater_plaguebone (25%)

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

citymist_71, range=42 (211,-307,274)

a_mist_golem (100%)

citymist_50076128, range=24 (243,-350,-15)

citymist_50076130, range=39 (242,-365,41)

citymist_50076132, range=51 (198,-334,-11)

citymist_50076133, range=71 (182,-350,63)

citymist_50076136, range=74 (210,-389,274)

citymist_50076144, range=60 (189,-324,274)

a_fog_golem (50%)
greater_war_boned_skeleton (50%)

citymist_50076149, range=9 (258,-329,77)

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

citymist_50076152, range=89 (167,-291,77)

a_phantom (50%)
a_phantom (50%)
a_phantom (50%)
a_phantom (50%)

citymist_50076156, range=75 (185,-286,77)

citymist_50076158, range=85 (199,-395,273)

citymist_50076167, range=53 (262,-378,39)

greater_spurbone (50%)
greater_spurbone (50%)

citymist_50076168, range=30 (219,-327,273)

citymist_50076169, range=37 (279,-348,75)

gyrating_goo (100%)

citymist_50076170, range=13 (260,-333,240)

gyrating_goo (100%)
gyrating_goo (100%)