NPCs composing that spawngroup :

a_fog_golem (33%)

a_lost_one (33%)

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

citymist_56, range=99 (262,-334,-14)

greater_war_boned_skeleton (33%)
greater_war_boned_skeleton (34%)

citymist_58, range=55 (265,-387,-13)

greater_plaguebone (25%)

citymist_59, range=80 (262,-354,39)

citymist_62, range=78 (227,-348,-14)

a_shadow (25%)
plaguebone_skeleton (25%)

citymist_88, range=39 (199,-396,275)

citymist_116, range=64 (182,-378,65)

citymist_117, range=77 (214,-349,64)

citymist_125, range=67 (259,-369,255)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_127, range=98 (219,-328,274)