NPCs composing that spawngroup :

a_greater_skeleton (50%)

ice_boned_skeleton (50%)

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

befallen_57, range=123 (-750,32,-66)

befallen_54, range=165 (-652,113,-66)

a_greater_skeleton (50%)
a_necro_acolyte (50%)

befallen_53, range=140 (-676,130,-68)

befallen_52, range=171 (-678,35,-67)

befallen_51, range=32 (-843,154,-66)

befallen_50, range=32 (-835,162,-66)

a_greater_skeleton (50%)
a_lesser_mummy (50%)

befallen_62, range=113 (-887,48,-67)

a_greater_skeleton (50%)
a_necro_acolyte (50%)

befallen_78, range=163 (-852,-23,-67)

befallen_86, range=98 (-818,38,-67)

a_ghoul (33%)
a_ghoul (33%)
a_ghoul (34%)

befallen_87, range=113 (-875,39,-66)