NPCs composing that spawngroup :

a_ghoul (50%)

ice_boned_skeleton (50%)

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

befallen_56, range=29 (-365,104,-10)

skeleton_Lrodd (50%)
skeleton_Lrodd (50%)

befallen_45, range=33 (-359,91,-68)

a_ghoul (50%)
a_necro_acolyte (50%)

befallen_43, range=73 (-319,84,-10)

befallen_42, range=4 (-395,95,-11)

befallen_33, range=95 (-332,166,-12)

befallen_60, range=29 (-373,69,-10)

befallen_85, range=93 (-483,71,-78)

a_greater_skeleton (50%)
ice_boned_skeleton (50%)

befallen_88, range=10 (-400,98,-39)

befallen_89, range=65 (-456,80,-39)

befallen_90, range=46 (-437,104,-39)

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

befallen_92, range=87 (-372,7,-39)

befallen_106, range=94 (-486,86,-77)

befallen_109, range=71 (-438,37,-75)

ice_boned_skeleton (50%)
ice_boned_skeleton (50%)

befallen_112, range=94 (-401,-2,-67)

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