NPCs composing that spawngroup :

a_cracked_skeleton (34%)

a_putrid_skeleton (33%)

a_sturdy_skeleton (33%)

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

befallen_56, range=31 (-365,104,-10)

skeleton_Lrodd (50%)
skeleton_Lrodd (50%)

befallen_45, range=36 (-359,91,-68)

a_ghoul (50%)
a_necro_acolyte (50%)

befallen_43, range=76 (-319,84,-10)

befallen_41, range=4 (-392,92,-67)

a_ghoul (50%)
ice_boned_skeleton (50%)

befallen_33, range=94 (-332,166,-12)

befallen_60, range=34 (-373,69,-10)

befallen_85, range=91 (-483,71,-78)

a_greater_skeleton (50%)
ice_boned_skeleton (50%)

befallen_88, range=5 (-400,98,-39)

befallen_89, range=62 (-456,80,-39)

befallen_90, range=42 (-437,104,-39)

befallen_91, range=69 (-372,29,-39)

befallen_92, range=90 (-372,7,-39)

befallen_106, range=91 (-486,86,-77)

befallen_109, range=72 (-438,37,-75)

ice_boned_skeleton (50%)
ice_boned_skeleton (50%)

befallen_110, range=99 (-494,95,-76)

befallen_112, range=97 (-401,-2,-67)

befallen_115, range=72 (-449,47,-38)