NPCs composing that spawngroup :

#The_Crypt_Excavator (50%)

a_helot_spectre (50%)

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

charasis_5, range=167 (-513,-274,4)

hexbone_skeleton (100%)

charasis_35, range=88 (-321,-405,5)

a_bottomless_devourer (50%)
a_pulsating_bile (50%)

charasis_36, range=86 (-373,-326,4)

charasis_37, range=93 (-387,-314,5)

a_bottomless_devourer (100%)

charasis_38, range=91 (-402,-314,4)

charasis_39, range=157 (-387,-250,4)

a_sepulcher_skeleton (50%)
a_sepulcher_skeleton (50%)

charasis_40, range=109 (-375,-301,4)

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

a_bottomless_devourer (50%)
a_helot_skeleton (50%)

charasis_95, range=124 (-285,-411,4)

charasis_166, range=142 (-267,-412,4)

charasis_167, range=124 (-285,-393,4)

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