NPCs composing that spawngroup :

a_dread_bone (33%)

a_greater_skeleton (33%)

a_lesser_mummy (34%)

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

befallen_76, range=99 (-647,-21,-66)

befallen_77, range=87 (-627,-33,-67)

befallen_85, range=90 (-483,71,-78)

a_greater_skeleton (50%)
ice_boned_skeleton (50%)

befallen_98, range=83 (-586,-60,-39)

befallen_105, range=72 (-552,-54,-39)

a_dread_bone (50%)
a_shadowknight (50%)

befallen_106, range=97 (-486,86,-77)

befallen_110, range=98 (-494,95,-76)

befallen_111, range=86 (-470,7,-72)

befallen_113, range=91 (-465,20,-39)

befallen_116, range=68 (-540,85,-39)

befallen_117, range=78 (-591,88,-39)

befallen_123, range=17 (-571,26,-39)