NPCs composing that spawngroup :

a_helot_spectre (25%)

a_sepulcher_skeleton (25%)

elementalbone_skeleton (25%)

hexbone_skeleton (25%)

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

charasis_11, range=168 (-99,-388,5)

a_helot_spectre (100%)

charasis_34, range=141 (-409,-405,5)

#The_Crypt_Excavator (50%)
a_helot_spectre (50%)

charasis_35, range=54 (-321,-405,5)

a_bottomless_devourer (50%)
a_pulsating_bile (50%)

charasis_36, range=125 (-373,-326,4)

charasis_37, range=143 (-387,-314,5)

a_bottomless_devourer (100%)

charasis_38, range=156 (-402,-314,4)

charasis_39, range=187 (-387,-250,4)

a_sepulcher_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_40, range=142 (-375,-301,4)

charasis_92, range=189 (-82,-355,4)

charasis_95, range=24 (-285,-411,4)

charasis_166, range=18 (-267,-412,4)

charasis_167, range=18 (-285,-393,4)

charasis_182, range=188 (-267,-206,-158)

charasis_183, range=166 (-239,-230,-158)

charasis_197, range=184 (-83,-381,4)

charasis_198, range=152 (-115,-381,5)

charasis_199, range=155 (-116,-357,5)