NPCs composing that spawngroup :

a_helot_spectre (100%)

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

charasis_44, range=75 (-271,45,4)

an_undertaker_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_55, range=176 (-460,128,3)

a_pulsating_bile (100%)

charasis_58, range=95 (-269,25,4)

a_sepulcher_skeleton (100%)

charasis_96, range=130 (-351,8,14)

a_sepulcher_skeleton (100%)

charasis_97, range=169 (-408,4,14)

an_undertaker_skeleton (50%)
a_pulsating_bile (50%)

charasis_99, range=137 (-333,-8,15)

charasis_103, range=63 (-273,182,4)

charasis_104, range=84 (-368,134,4)

a_sepulcher_skeleton (100%)

charasis_131, range=161 (-263,280,22)

charasis_132, range=186 (-221,296,23)

charasis_135, range=178 (-243,294,22)

charasis_137, range=140 (-221,246,23)

charasis_138, range=155 (-189,243,22)

charasis_139, range=140 (-188,222,22)

charasis_155, range=167 (-154,224,-139)

charasis_156, range=192 (-136,242,-162)

a_sepulcher_skeleton (50%)
greater_plaguebone (50%)

charasis_160, range=123 (-332,6,14)

charasis_161, range=163 (-444,153,4)

charasis_162, range=199 (-481,150,4)

charasis_163, range=191 (-475,133,4)

charasis_164, range=159 (-443,131,5)

charasis_165, range=66 (-226,152,4)

charasis_178, range=189 (-244,-66,-127)

a_sepulcher_skeleton (100%)

charasis_179, range=150 (-387,10,-139)

a_bottomless_feaster (100%)

charasis_180, range=152 (-227,-21,-122)

charasis_181, range=144 (-257,-22,-122)

a_crypt_spectre_189514, range=54 (-237,147,5)