NPCs composing that spawngroup :

an_undertaker_skeleton (20%)

a_sepulcher_skeleton (20%)

a_sepulcher_skeleton (20%)

a_sepulcher_spectre (20%)

a_sepulcher_spectre (20%)

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

charasis_39, range=156 (-387,-250,4)

a_sepulcher_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_40, range=190 (-375,-301,4)

charasis_44, range=185 (-271,45,4)

an_undertaker_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_52, range=15 (-267,-127,22)

hexbone_skeleton (100%)

charasis_57, range=186 (-460,-117,4)

charasis_58, range=165 (-269,25,4)

a_sepulcher_skeleton (100%)
a_sepulcher_skeleton (100%)

charasis_60, range=35 (-250,-114,22)

charasis_61, range=92 (-182,-140,22)

charasis_62, range=85 (-223,-71,22)

charasis_93, range=93 (-367,-137,4)

charasis_94, range=123 (-389,-96,4)

charasis_96, range=166 (-351,8,14)

a_sepulcher_skeleton (100%)

charasis_97, range=196 (-408,4,14)

an_undertaker_skeleton (50%)
a_pulsating_bile (50%)

charasis_99, range=144 (-333,-8,15)

charasis_105, range=166 (-440,-156,5)

charasis_108, range=116 (-390,-138,4)

charasis_109, range=102 (-367,-96,5)

charasis_160, range=157 (-332,6,14)

charasis_178, range=80 (-244,-66,-127)

a_sepulcher_skeleton (100%)

charasis_179, range=187 (-387,10,-139)

a_bottomless_feaster (100%)
a_bottomless_feaster (100%)

charasis_180, range=127 (-227,-21,-122)

charasis_181, range=119 (-257,-22,-122)

charasis_182, range=66 (-267,-206,-158)

charasis_183, range=96 (-239,-230,-158)

a_crypt_spectre_189513, range=167 (-439,-171,5)