NPCs composing that spawngroup :

a_cracked_skeleton (33%)

a_necro_neophyte (34%)

a_putrid_skeleton (33%)

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

befallen_23, range=46 (-253,-179,-9)

a_giant_rat (50%)
a_plague_rat (50%)

befallen_22, range=87 (-250,-134,-10)

befallen_16, range=98 (-189,-244,-11)

befallen_15, range=66 (-217,-211,-11)

befallen_61, range=74 (-273,-141,-11)

befallen_66, range=46 (-277,-169,-11)

befallen_67, range=24 (-293,-237,-12)

befallen_69, range=43 (-325,-226,-11)

a_cracked_skeleton (50%)
a_necro_neophyte (50%)

befallen_70, range=96 (-363,-161,-39)

a_necro_initiate (50%)
a_zombie (50%)

befallen_102, range=99 (-295,-116,-10)

befallen_103, range=70 (-334,-167,-9)