NPCs composing that spawngroup :

a_deranged_madman (33%)

a_mist_golem (33%)

greater_war_boned_skeleton (34%)

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

citymist_54, range=89 (133,-353,39)

a_fog_golem (34%)
a_rambling_fanatic (33%)

citymist_56, range=43 (262,-334,-14)

greater_war_boned_skeleton (33%)
greater_war_boned_skeleton (34%)

citymist_58, range=74 (265,-387,-13)

greater_plaguebone (25%)

citymist_59, range=50 (262,-354,39)

citymist_60, range=98 (225,-426,39)

a_fog_golem (33%)
a_lost_one (33%)

citymist_61, range=96 (130,-364,-13)

citymist_62, range=21 (227,-348,-14)

a_shadow (25%)
plaguebone_skeleton (25%)

citymist_86, range=99 (121,-312,256)

citymist_87, range=84 (136,-342,275)

citymist_88, range=70 (199,-396,275)

citymist_92, range=72 (162,-284,76)

citymist_93, range=47 (212,-281,76)

citymist_94, range=30 (249,-327,77)

citymist_116, range=62 (182,-378,65)

citymist_117, range=21 (214,-349,64)

citymist_125, range=57 (259,-369,255)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_128, range=30 (189,-325,274)

citymist_129, range=45 (201,-286,275)

greater_war_boned_skeleton (25%)
greater_war_boned_skeleton (25%)

citymist_132, range=83 (189,-250,1)