NPCs composing that spawngroup :

#The_Skeleton_Sepulcher (25%)

a_sepulcher_skeleton (25%)

a_sepulcher_skeleton (25%)

hexbone_skeleton (25%)

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

charasis_39, range=153 (-387,-250,4)

a_sepulcher_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_44, range=184 (-271,45,4)

an_undertaker_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_52, range=125 (-267,-127,22)

hexbone_skeleton (100%)

charasis_55, range=114 (-484,-32,3)

a_pulsating_bile (100%)

charasis_56, range=177 (-566,-117,4)

a_helot_skeleton (100%)

charasis_57, range=73 (-460,-117,4)

charasis_58, range=171 (-269,25,4)

a_sepulcher_skeleton (100%)
a_sepulcher_skeleton (100%)

charasis_59, range=123 (-274,-140,23)

charasis_60, range=140 (-250,-114,22)

charasis_62, range=167 (-223,-71,22)

charasis_93, range=46 (-367,-137,4)

charasis_96, range=111 (-351,8,14)

a_sepulcher_skeleton (100%)

charasis_97, range=101 (-408,4,14)

an_undertaker_skeleton (50%)
a_pulsating_bile (50%)

charasis_99, range=104 (-333,-8,15)

charasis_105, range=78 (-440,-156,5)

charasis_107, range=115 (-479,-168,5)

charasis_108, range=42 (-390,-138,4)

charasis_109, range=22 (-367,-96,5)

charasis_160, range=116 (-332,6,14)

charasis_169, range=164 (-553,-103,5)

charasis_171, range=191 (-576,-139,3)

charasis_172, range=191 (-580,-97,4)

charasis_178, range=149 (-244,-66,-127)

a_sepulcher_skeleton (100%)

charasis_179, range=106 (-387,10,-139)

a_bottomless_feaster (100%)

charasis_180, range=178 (-227,-21,-122)

charasis_181, range=151 (-257,-22,-122)

charasis_182, range=164 (-267,-206,-158)

a_crypt_spectre_189513, range=90 (-439,-171,5)