NPCs composing that spawngroup :

a_large_plague_rat (33%)

a_necro_neophyte (33%)

a_putrid_skeleton (34%)

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

befallen_56, range=50 (-365,104,-10)

skeleton_Lrodd (50%)
skeleton_Lrodd (50%)

befallen_45, range=40 (-359,91,-68)

a_ghoul (50%)
a_necro_acolyte (50%)

befallen_44, range=44 (-275,80,-11)

a_necro_neophyte (50%)
a_putrid_skeleton (50%)

befallen_42, range=76 (-395,95,-11)

befallen_41, range=73 (-392,92,-67)

a_ghoul (50%)
ice_boned_skeleton (50%)

befallen_40, range=71 (-328,13,-12)

befallen_39, range=61 (-287,31,-11)

befallen_38, range=79 (-289,10,-11)

befallen_37, range=50 (-294,127,-10)

befallen_36, range=60 (-275,125,-10)

befallen_35, range=67 (-282,139,-11)

befallen_33, range=83 (-332,166,-12)

befallen_7, range=97 (-298,-11,-11)

a_skeletal_excavator (50%)
a_skeletal_excavator (50%)

befallen_60, range=55 (-373,69,-10)

befallen_88, range=82 (-400,98,-39)

befallen_91, range=76 (-372,29,-39)

befallen_92, range=93 (-372,7,-39)