NPCs composing that spawngroup :

a_ghoul (50%)

ice_boned_skeleton (50%)

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

befallen_32, range=113 (-999,-62,-66)

a_greater_skeleton (50%)
a_willowisp (50%)

befallen_12, range=32 (-975,-206,-69)

a_necro_acolyte (50%)
ice_boned_skeleton (50%)

befallen_11, range=20 (-988,-195,-69)

a_ghoul (33%)
a_shadowknight (33%)
a_zombie (34%)

befallen_1, range=174 (-814,-206,-68)

Boondin_Babbinsbort (100%)

befallen_63, range=142 (-847,-205,-66)

befallen_64, range=190 (-797,-148,-68)

befallen_79, range=156 (-837,-127,-67)

befallen_80, range=180 (-821,-103,-66)

befallen_82, range=144 (-851,-227,-66)

befallen_83, range=133 (-900,-73,-66)

befallen_84, range=122 (-902,-86,-66)

a_greater_skeleton (50%)
a_necro_acolyte (50%)

befallen_107, range=96 (-1002,-80,-66)