NPCs composing that spawngroup :

a_bile_sentient (20%)

a_crypt_golem (20%)

a_crypt_wurm (20%)

pulsating_bile (20%)

the_Spectre_Sepulcher (20%)

NPCs spawning around that spawngroup :
(Max range : 100)

charasis_a_sepulcher_skeleton1, range=63 (436,120,3)

charasis_greater_war_boned_skeleton36, range=99 (368,178,3)

greater_war_boned_skeleton (100%)

charasis_greater_plaguebone57, range=69 (377,11,3)

greater_plaguebone (100%)

charasis_222833, range=65 (387,145,3)

a_sepulcher_skeleton (100%)

charasis_222839, range=81 (339,146,5)

a_bottomless_feaster (50%)
a_bottomless_gnawer (50%)