NPCs composing that spawngroup :

gyrating_goo (100%)

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

citymist_71, range=79 (211,-307,274)

a_mist_golem (100%)

citymist_50076128, range=36 (243,-350,-15)

citymist_50076130, range=40 (242,-365,41)

citymist_50076131, range=94 (225,-425,41)

citymist_50076132, range=82 (198,-334,-11)

citymist_50076133, range=97 (182,-350,63)

citymist_50076136, range=80 (210,-389,274)

citymist_50076141, range=37 (249,-326,75)

citymist_50076144, range=93 (189,-324,274)

a_fog_golem (50%)
greater_war_boned_skeleton (50%)

citymist_50076149, range=28 (258,-329,77)

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

citymist_50076152, range=97 (182,-350,65)

a_phantom (50%)
a_phantom (50%)

citymist_50076158, range=92 (199,-395,273)

citymist_50076162, range=92 (226,-424,4)

citymist_50076167, range=34 (262,-378,39)

greater_spurbone (50%)
greater_spurbone (50%)

citymist_50076168, range=63 (219,-327,273)

citymist_50076170, range=24 (260,-333,240)

gyrating_goo (100%)
gyrating_goo (100%)