NPCs composing that spawngroup :

a_wraith (100%)

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

citymist_35, range=36 (102,-350,3)

citymist_54, range=60 (133,-353,39)

citymist_61, range=53 (130,-364,-13)

citymist_80, range=59 (29,-344,255)

#Gyrating_Green_Slime (50%)
gyrating_goo (50%)

citymist_83, range=34 (77,-343,256)

greater_war_boned_skeleton (100%)

citymist_85, range=43 (121,-373,256)

citymist_86, range=77 (121,-312,256)

citymist_87, range=67 (136,-342,275)

citymist_96, range=63 (79,-314,77)

citymist_138, range=37 (64,-412,10)

citymist_154, range=78 (0,-387,10)

an_aberrant (50%)
a_haze_golem (50%)