NPCs composing that spawngroup :

#Insidious_Cloak (100%)

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

befallen_85, range=92 (-483,71,-78)

a_greater_skeleton (50%)
ice_boned_skeleton (50%)

befallen_106, range=80 (-486,86,-77)

a_ghoul (50%)
the_thaumaturgist (50%)

befallen_110, range=69 (-494,95,-76)

befallen_116, range=47 (-540,85,-39)

befallen_117, range=57 (-591,88,-39)

befallen_118, range=33 (-568,161,-39)

befallen_119, range=60 (-546,191,-38)

befallen_120, range=34 (-519,130,-39)

befallen_121, range=46 (-511,152,-39)

befallen-#a_tiny_insignificance000, range=99 (-457,107,-39)

#a_tiny_insignificance (100%)