NPCs composing that spawngroup :

a_greater_skeleton (50%)

a_willowisp (50%)

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

befallen_12, range=145 (-975,-206,-69)

a_necro_acolyte (50%)
ice_boned_skeleton (50%)

befallen_11, range=133 (-988,-195,-69)

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

befallen_10, range=113 (-986,-175,-68)

a_ghoul (50%)
ice_boned_skeleton (50%)

befallen_62, range=156 (-887,48,-67)

a_greater_skeleton (50%)
a_necro_acolyte (50%)

befallen_78, range=152 (-852,-23,-67)

befallen_79, range=174 (-837,-127,-67)

befallen_80, range=182 (-821,-103,-66)

befallen_83, range=99 (-900,-73,-66)

befallen_84, range=99 (-902,-86,-66)

a_greater_skeleton (50%)
a_necro_acolyte (50%)

befallen_87, range=159 (-875,39,-66)

befallen_107, range=18 (-1002,-80,-66)