NPCs composing that spawngroup :

a_greater_skeleton (33%)

a_necro_apprentice (34%)

a_sturdy_skeleton (33%)

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

befallen_56, range=72 (-365,104,-10)

skeleton_Lrodd (50%)
skeleton_Lrodd (50%)

befallen_45, range=79 (-359,91,-68)

a_ghoul (50%)
a_necro_acolyte (50%)

befallen_42, range=42 (-395,95,-11)

befallen_41, range=46 (-392,92,-67)

a_ghoul (50%)
ice_boned_skeleton (50%)

befallen_60, range=73 (-373,69,-10)

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

a_greater_skeleton (50%)
ice_boned_skeleton (50%)

befallen_88, range=37 (-400,98,-39)

befallen_89, range=30 (-456,80,-39)

befallen_91, range=99 (-372,29,-39)

befallen_106, range=52 (-486,86,-77)

befallen_109, range=67 (-438,37,-75)

ice_boned_skeleton (50%)
ice_boned_skeleton (50%)

befallen_110, range=57 (-494,95,-76)

befallen_113, range=88 (-465,20,-39)

befallen_115, range=58 (-449,47,-38)

befallen_120, range=86 (-519,130,-39)

befallen_121, range=88 (-511,152,-39)