NPCs composing that spawngroup :

an_army_behemoth (16%)

a_mist_golem (16%)

a_phantom (16%)

a_wraith (16%)

greater_war_boned_skeleton (16%)

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

citymist_102, range=73 (-116,-566,75)

citymist_143, range=22 (-154,-620,5)

an_apparition (50%)
greater_spurbone (50%)

citymist_144, range=83 (-141,-553,3)

citymist_146, range=42 (-138,-594,3)

an_apparition (100%)

citymist_149, range=92 (-230,-623,23)

citymist_150, range=96 (-234,-626,5)

a_shadow (16%)
plaguebone_skeleton (16%)

citymist_162, range=64 (-100,-584,22)

citymist_163, range=39 (-100,-645,23)