NPCs composing that spawngroup :

an_undertaker_skeleton (25%)

a_helot_spectre (25%)

a_sepulcher_skeleton (25%)

elementalbone_skeleton (25%)

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

charasis_5, range=148 (-513,-274,4)

hexbone_skeleton (100%)

charasis_34, range=86 (-409,-405,5)

#The_Crypt_Excavator (50%)
a_helot_spectre (50%)

charasis_35, range=94 (-321,-405,5)

a_bottomless_devourer (50%)
a_pulsating_bile (50%)

charasis_37, range=18 (-387,-314,5)

a_bottomless_devourer (100%)

charasis_38, range=31 (-402,-314,4)

charasis_39, range=77 (-387,-250,4)

a_sepulcher_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_40, range=25 (-375,-301,4)

charasis_41, range=196 (-567,-296,4)

a_bottomless_devourer (50%)
a_helot_skeleton (50%)

charasis_93, range=189 (-367,-137,4)

charasis_95, range=122 (-285,-411,4)

charasis_105, range=182 (-440,-156,5)

charasis_107, range=190 (-479,-168,5)

charasis_108, range=188 (-390,-138,4)

charasis_166, range=136 (-267,-412,4)

charasis_167, range=110 (-285,-393,4)

charasis_168, range=125 (-267,-394,4)

charasis_182, range=160 (-267,-206,-158)

charasis_183, range=164 (-239,-230,-158)

a_crypt_spectre_189513, range=168 (-439,-171,5)