NPCs composing that spawngroup :

an_undead_oblation (25%)

a_sepulcher_skeleton (25%)

a_sepulcher_skeleton (25%)

a_sepulcher_spectre (25%)

NPCs spawning around that spawngroup :
(Max range : 200)

charasis_44, range=79 (-271,45,4)

an_undertaker_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_52, range=112 (-267,-127,22)

hexbone_skeleton (100%)

charasis_58, range=62 (-269,25,4)

a_sepulcher_skeleton (100%)
a_sepulcher_skeleton (100%)

charasis_59, range=127 (-274,-140,23)

charasis_60, range=95 (-250,-114,22)

charasis_61, range=127 (-182,-140,22)

charasis_62, range=50 (-223,-71,22)

charasis_93, range=181 (-367,-137,4)

charasis_94, range=178 (-389,-96,4)

charasis_96, range=127 (-351,8,14)

a_sepulcher_skeleton (100%)

charasis_97, range=182 (-408,4,14)

an_undertaker_skeleton (50%)
a_pulsating_bile (50%)

charasis_98, range=152 (-284,120,5)

a_helot_spectre (100%)

charasis_99, range=106 (-333,-8,15)

charasis_109, range=158 (-367,-96,5)

charasis_111, range=133 (-96,-42,-189)

greater_war_boned_skeleton (100%)

charasis_160, range=108 (-332,6,14)

charasis_165, range=173 (-226,152,4)

charasis_178, range=47 (-244,-66,-127)

a_sepulcher_skeleton (100%)

charasis_179, range=162 (-387,10,-139)

a_bottomless_feaster (100%)
a_bottomless_feaster (100%)

charasis_181, range=30 (-257,-22,-122)

charasis_182, range=189 (-267,-206,-158)

a_crypt_spectre_189514, range=168 (-237,147,5)