NPCs composing that spawngroup :

a_ghoul (33%)

a_necro_acolyte (34%)

ice_boned_skeleton (33%)

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

befallen_47, range=95 (-512,-79,-66)

befallen_85, range=65 (-483,71,-78)

a_greater_skeleton (50%)
ice_boned_skeleton (50%)

befallen_89, range=74 (-456,80,-39)

befallen_92, range=98 (-372,7,-39)

befallen_93, range=40 (-456,-31,-38)

a_greater_skeleton (50%)
a_sturdy_skeleton (50%)

befallen_96, range=94 (-437,-82,-40)

a_necro_neophyte (50%)
a_zombie (50%)

befallen_106, range=80 (-486,86,-77)

befallen_109, range=43 (-438,37,-75)

ice_boned_skeleton (50%)
ice_boned_skeleton (50%)

befallen_110, range=91 (-494,95,-76)

befallen_112, range=69 (-401,-2,-67)

befallen_113, range=13 (-465,20,-39)

befallen_114, range=84 (-400,-41,-38)

befallen_115, range=45 (-449,47,-38)

befallen_124, range=86 (-556,18,-38)