NPCs composing that spawngroup :

ice_boned_skeleton (50%)

ice_boned_skeleton (50%)

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

befallen_56, range=99 (-365,104,-10)

skeleton_Lrodd (50%)
skeleton_Lrodd (50%)

befallen_45, range=95 (-359,91,-68)

a_ghoul (50%)
a_necro_acolyte (50%)

befallen_42, range=72 (-395,95,-11)

befallen_41, range=71 (-392,92,-67)

a_ghoul (50%)
ice_boned_skeleton (50%)

befallen_60, range=72 (-373,69,-10)

befallen_85, range=56 (-483,71,-78)

a_greater_skeleton (50%)
ice_boned_skeleton (50%)

befallen_88, range=71 (-400,98,-39)

befallen_89, range=46 (-456,80,-39)

befallen_90, range=67 (-437,104,-39)

befallen_91, range=66 (-372,29,-39)

befallen_92, range=72 (-372,7,-39)

befallen_93, range=70 (-456,-31,-38)

a_greater_skeleton (50%)
a_sturdy_skeleton (50%)

befallen_106, range=68 (-486,86,-77)

befallen_110, range=80 (-494,95,-76)

befallen_111, range=43 (-470,7,-72)

befallen_112, range=53 (-401,-2,-67)

befallen_113, range=31 (-465,20,-39)

befallen_114, range=86 (-400,-41,-38)

befallen_115, range=14 (-449,47,-38)