NPCs composing that spawngroup :

a_burnt_zombie (50%)

a_lesser_mummy (50%)

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

befallen_49, range=85 (-592,-97,-69)

befallen_47, range=82 (-512,-79,-66)

befallen_46, range=83 (-480,-94,-67)

befallen_72, range=42 (-491,-166,-39)

a_dread_bone (50%)
a_dread_bone (50%)

befallen_73, range=79 (-500,-231,-39)

a_dread_bone (100%)

befallen_81, range=93 (-622,-186,-68)

befallen_100, range=70 (-488,-105,-38)

a_large_plague_rat (50%)
a_necro_neophyte (50%)

befallen_104, range=90 (-623,-162,-66)

befallen_108, range=98 (-435,-150,-69)