NPCs composing that spawngroup :

a_sepulcher_skeleton (100%)

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

charasis_44, range=88 (-271,45,4)

an_undertaker_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_58, range=84 (-269,25,4)

a_sepulcher_skeleton (100%)
a_sepulcher_skeleton (100%)

charasis_97, range=56 (-408,4,14)

an_undertaker_skeleton (50%)
a_pulsating_bile (50%)

charasis_99, range=24 (-333,-8,15)

charasis_160, range=19 (-332,6,14)

charasis_179, range=35 (-387,10,-139)

a_bottomless_feaster (100%)

charasis_181, range=98 (-257,-22,-122)