NPCs composing that spawngroup :

a_bottomless_devourer (50%)

a_helot_skeleton (50%)

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

charasis_5, range=58 (-513,-274,4)

hexbone_skeleton (100%)

charasis_34, range=192 (-409,-405,5)

#The_Crypt_Excavator (50%)
a_helot_spectre (50%)

charasis_36, range=196 (-373,-326,4)

charasis_37, range=181 (-387,-314,5)

a_bottomless_devourer (100%)

charasis_38, range=165 (-402,-314,4)

charasis_39, range=186 (-387,-250,4)

a_sepulcher_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_40, range=192 (-375,-301,4)

charasis_42, range=85 (-553,-212,4)

charasis_43, range=84 (-579,-212,4)

charasis_44, range=110 (-652,-226,4)

an_undertaker_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_56, range=179 (-566,-117,4)

a_helot_skeleton (100%)

charasis_105, range=189 (-440,-156,5)

charasis_107, range=155 (-479,-168,5)

charasis_169, range=193 (-553,-103,5)

charasis_171, range=157 (-576,-139,3)

charasis_172, range=199 (-580,-97,4)

a_crypt_spectre_189513, range=178 (-439,-171,5)