NPCs composing that spawngroup :

a_necro_neophyte (50%)

a_zombie (50%)

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

befallen_59, range=68 (-372,-105,-78)

befallen_58, range=90 (-357,-124,-82)

befallen_47, range=75 (-512,-79,-66)

befallen_46, range=44 (-480,-94,-67)

befallen_71, range=80 (-358,-96,-80)

a_dread_bone (50%)
a_dread_bone (50%)

befallen_72, range=99 (-491,-166,-39)

befallen_93, range=54 (-456,-31,-38)

a_greater_skeleton (50%)
a_sturdy_skeleton (50%)

befallen_97, range=38 (-416,-114,-39)

a_lesser_mummy (50%)
a_sturdy_skeleton (50%)

befallen_99, range=48 (-392,-100,-38)

a_greater_skeleton (50%)
a_lesser_mummy (50%)

befallen_100, range=55 (-488,-105,-38)

a_large_plague_rat (50%)
a_necro_neophyte (50%)

befallen_108, range=68 (-435,-150,-69)

befallen_111, range=94 (-470,7,-72)

befallen_112, range=87 (-401,-2,-67)

befallen_114, range=55 (-400,-41,-38)