NPCs composing that spawngroup :

an_undertaker_skeleton (25%)

a_sepulcher_spectre (25%)

elementalbone_skeleton (25%)

elementalbone_skeleton (25%)

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

charasis_5, range=140 (-513,-274,4)

hexbone_skeleton (100%)

charasis_34, range=109 (-409,-405,5)

#The_Crypt_Excavator (50%)
a_helot_spectre (50%)

charasis_35, range=116 (-321,-405,5)

a_bottomless_devourer (50%)
a_pulsating_bile (50%)

charasis_36, range=25 (-373,-326,4)

charasis_37, range=17 (-387,-314,5)

a_bottomless_devourer (100%)

charasis_38, range=29 (-402,-314,4)

charasis_39, range=52 (-387,-250,4)

a_sepulcher_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_41, range=191 (-567,-296,4)

a_bottomless_devourer (50%)
a_helot_skeleton (50%)

charasis_42, range=199 (-553,-212,4)

charasis_59, range=190 (-274,-140,23)

charasis_93, range=164 (-367,-137,4)

charasis_95, range=142 (-285,-411,4)

charasis_105, range=158 (-440,-156,5)

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

charasis_108, range=163 (-390,-138,4)

charasis_166, range=154 (-267,-412,4)

charasis_167, range=128 (-285,-393,4)

charasis_168, range=142 (-267,-394,4)

charasis_182, range=143 (-267,-206,-158)

charasis_183, range=153 (-239,-230,-158)

a_crypt_spectre_189513, range=144 (-439,-171,5)