NPCs composing that spawngroup :

a_dread_bone (33%)

a_greater_skeleton (33%)

a_necro_apprentice (34%)

NPCs spawning around that spawngroup :
(Max range : 200)

befallen_54, range=131 (-652,113,-66)

a_greater_skeleton (50%)
a_necro_acolyte (50%)

befallen_53, range=143 (-676,130,-68)

befallen_42, range=178 (-395,95,-11)

befallen_41, range=183 (-392,92,-67)

a_ghoul (50%)
ice_boned_skeleton (50%)

befallen_85, range=135 (-483,71,-78)

a_greater_skeleton (50%)
ice_boned_skeleton (50%)

befallen_88, range=173 (-400,98,-39)

befallen_89, range=142 (-456,80,-39)

befallen_90, range=139 (-437,104,-39)

befallen_106, range=120 (-486,86,-77)

befallen_109, range=188 (-438,37,-75)

ice_boned_skeleton (50%)
ice_boned_skeleton (50%)

befallen_110, range=109 (-494,95,-76)

befallen_111, range=199 (-470,7,-72)

befallen_113, range=189 (-465,20,-39)

befallen_115, range=173 (-449,47,-38)

befallen_116, range=106 (-540,85,-39)

befallen_117, range=112 (-591,88,-39)

befallen_118, range=37 (-568,161,-39)

befallen_120, range=66 (-519,130,-39)

befallen_121, range=52 (-511,152,-39)

befallen_123, range=166 (-571,26,-39)

befallen_124, range=173 (-556,18,-38)