NPCs composing that spawngroup :

greater_plaguebone (25%)

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

citymist_19, range=89 (-19,-38,1)

citymist_26, range=97 (-79,79,2)

citymist_46, range=57 (66,65,2)

citymist_55, range=91 (24,-45,2)

citymist_67, range=72 (31,-24,274)

greater_war_boned_skeleton (100%)

citymist_131, range=26 (-13,45,28)

citymist_greater_plaguebone12_takp_import_v0, range=25 (-12,49,27)

greater_plaguebone (50%)
greater_plaguebone (50%)

citymist_222973_takp_import_v0, range=3 (13,49,28)

a_fog_golem (50%)
a_vapor_golem (50%)

citymist_greater_spurbone86_takp_import_v0, range=88 (91,5,3)

greater_spurbone (50%)
greater_spurbone (50%)

citymist_222954_takp_import_v0, range=40 (1,85,7)

Lhranc (100%)

citymist_Lhranc000_17559259, range=53 (-17,90,6)

Lhranc (100%)