NPCs composing that spawngroup :

gyrating_goo (33%)

gyrating_goo (33%)

gyrating_goo (34%)

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

citymist_47, range=63 (-62,-163,-8)

citymist_48, range=82 (-61,-217,5)

citymist_49, range=76 (-60,-117,0)

citymist_124, range=75 (62,-207,1)

an_apparition (50%)
plaguebone_skeleton (50%)

citymist_132, range=93 (-11,-256,7)