NPCs composing that spawngroup :

a_greater_skeleton (33%)

a_necro_acolyte (33%)

a_necro_theurgist (34%)

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

befallen_42, range=97 (-395,95,-11)

befallen_41, range=94 (-392,92,-67)

a_ghoul (50%)
ice_boned_skeleton (50%)

befallen_40, range=74 (-328,13,-12)

befallen_60, range=76 (-373,69,-10)

befallen_72, range=99 (-350,-88,-80)

a_dread_bone (50%)
a_dread_bone (50%)

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

befallen_91, range=42 (-372,29,-39)

befallen_92, range=30 (-372,7,-39)

befallen_93, range=62 (-456,-31,-38)

a_greater_skeleton (50%)
a_sturdy_skeleton (50%)

befallen_96, range=87 (-437,-82,-40)

a_necro_neophyte (50%)
a_zombie (50%)

befallen_99, range=98 (-392,-100,-38)

a_greater_skeleton (50%)
a_lesser_mummy (50%)

befallen_109, range=53 (-438,37,-75)

ice_boned_skeleton (50%)
ice_boned_skeleton (50%)

befallen_111, range=69 (-470,7,-72)

befallen_113, range=67 (-465,20,-39)

befallen_114, range=39 (-400,-41,-38)

befallen_115, range=68 (-449,47,-38)