NPCs composing that spawngroup :

a_ghoul (34%)

a_willowisp (33%)

ice_boned_skeleton (33%)

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

befallen_47, range=35 (-512,-79,-66)

befallen_72, range=72 (-491,-166,-39)

a_dread_bone (50%)
a_dread_bone (50%)

befallen_74, range=83 (-533,-159,-39)

a_burnt_zombie (50%)
a_lesser_mummy (50%)

befallen_93, range=67 (-456,-31,-38)

a_greater_skeleton (50%)
a_sturdy_skeleton (50%)

befallen_96, range=44 (-437,-82,-40)

a_necro_neophyte (50%)
a_zombie (50%)

befallen_97, range=67 (-416,-114,-39)

a_lesser_mummy (50%)
a_sturdy_skeleton (50%)

befallen_99, range=88 (-392,-100,-38)

a_greater_skeleton (50%)
a_lesser_mummy (50%)

befallen_100, range=13 (-488,-105,-38)

a_large_plague_rat (50%)
a_necro_neophyte (50%)

befallen_105, range=82 (-552,-54,-39)

a_dread_bone (50%)
a_shadowknight (50%)

befallen_108, range=71 (-435,-150,-69)

befallen_114, range=95 (-400,-41,-38)