NPCs composing that spawngroup :

a_deranged_madman (16%)

a_savage_mutant (16%)

greater_plaguebone (16%)

greater_war_boned_skeleton (16%)

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

citymist_56, range=72 (262,-334,-14)

greater_war_boned_skeleton (33%)
greater_war_boned_skeleton (34%)

citymist_59, range=88 (262,-354,39)

citymist_62, range=68 (227,-348,-14)

a_shadow (25%)
plaguebone_skeleton (25%)

citymist_86, range=96 (121,-312,256)

citymist_87, range=97 (136,-342,275)

citymist_92, range=50 (162,-284,76)

citymist_94, range=59 (249,-327,77)

citymist_117, range=67 (214,-349,64)

citymist_125, range=99 (259,-369,255)

gyrating_goo (50%)
gyrating_goo (50%)

citymist_127, range=47 (219,-328,274)

citymist_128, range=49 (189,-325,274)

citymist_129, range=12 (201,-286,275)

greater_war_boned_skeleton (25%)
greater_war_boned_skeleton (25%)

citymist_132, range=38 (189,-250,1)

citymist_170, range=94 (246,-193,2)