NPCs composing that spawngroup :

gyrating_goo (20%)

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

citymist_51, range=68 (250,-9,4)

citymist_57, range=63 (219,-88,1)

citymist_114, range=82 (262,-152,147)

citymist_126, range=85 (252,-152,147)

citymist_275173, range=27 (260,-90,4)