NPCs composing that spawngroup :

a_cracked_skeleton (50%)

a_necro_neophyte (50%)

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

befallen_23, range=85 (-253,-179,-9)

a_giant_rat (50%)
a_plague_rat (50%)

befallen_61, range=99 (-273,-141,-11)

befallen_66, range=74 (-277,-169,-11)

befallen_67, range=33 (-293,-237,-12)

befallen_68, range=43 (-283,-215,-11)

befallen_70, range=75 (-363,-161,-39)

a_necro_initiate (50%)
a_zombie (50%)

befallen_71, range=77 (-384,-175,-39)

a_dread_bone (50%)
a_dread_bone (50%)

befallen_103, range=59 (-334,-167,-9)