NPCs composing that spawngroup :

a_lesser_mummy (33%)

a_necro_acolyte (34%)

a_sturdy_skeleton (33%)

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

befallen_56, range=75 (-365,104,-10)

skeleton_Lrodd (50%)
skeleton_Lrodd (50%)

befallen_45, range=63 (-359,91,-68)

a_ghoul (50%)
a_necro_acolyte (50%)

befallen_43, range=76 (-319,84,-10)

befallen_42, range=69 (-395,95,-11)

befallen_41, range=66 (-392,92,-67)

a_ghoul (50%)
ice_boned_skeleton (50%)

befallen_40, range=46 (-328,13,-12)

befallen_39, range=85 (-287,31,-11)

befallen_38, range=85 (-289,10,-11)

befallen_7, range=84 (-298,-11,-11)

a_skeletal_excavator (50%)
a_skeletal_excavator (50%)

befallen_60, range=40 (-373,69,-10)

befallen_88, range=74 (-400,98,-39)

befallen_89, range=98 (-456,80,-39)

befallen_90, range=99 (-437,104,-39)

befallen_92, range=22 (-372,7,-39)

befallen_109, range=66 (-438,37,-75)

ice_boned_skeleton (50%)
ice_boned_skeleton (50%)

befallen_112, range=42 (-401,-2,-67)

befallen_113, range=93 (-465,20,-39)

befallen_114, range=75 (-400,-41,-38)

befallen_115, range=79 (-449,47,-38)