NPCs composing that spawngroup :

a_burnt_zombie (34%)

a_dread_bone (33%)

a_lesser_mummy (33%)

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

befallen_85, range=69 (-483,71,-78)

a_greater_skeleton (50%)
ice_boned_skeleton (50%)

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

befallen_90, range=86 (-437,104,-39)

befallen_106, range=55 (-486,86,-77)

befallen_110, range=43 (-494,95,-76)

befallen_116, range=49 (-540,85,-39)

befallen_117, range=83 (-591,88,-39)

befallen_118, range=57 (-568,161,-39)

befallen_119, range=66 (-546,191,-38)

befallen_121, range=23 (-511,152,-39)