NPCs composing that spawngroup :

an_undertaker_skeleton (33%)

a_sepulcher_skeleton (33%)

a_sepulcher_skeleton (34%)

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

charasis_11, range=187 (-99,-388,5)

a_helot_spectre (100%)

charasis_34, range=123 (-409,-405,5)

#The_Crypt_Excavator (50%)
a_helot_spectre (50%)

charasis_35, range=36 (-321,-405,5)

a_bottomless_devourer (50%)
a_pulsating_bile (50%)

charasis_36, range=122 (-373,-326,4)

charasis_37, range=140 (-387,-314,5)

a_bottomless_devourer (100%)

charasis_38, range=151 (-402,-314,4)

charasis_39, range=190 (-387,-250,4)

a_sepulcher_skeleton (50%)
a_sepulcher_skeleton (50%)

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

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

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

charasis_168, range=24 (-267,-394,4)

charasis_183, range=186 (-239,-230,-158)

charasis_198, range=172 (-115,-381,5)

charasis_199, range=177 (-116,-357,5)