User blog comment:Disfigure/Pictures of Black Scripture Members from the Official Data Book/@comment-76.218.192.169-20151103044533/@comment-27008999-20151103165710

I read a comment about the web novel, and the 5th seat, Clementine's brother, was on a mission to exterminate thousands of goblins in a forest, there he met Ainz. "Quintia" ( aka. 5th seat, sounds like 5th tier) used 2 gigant basilisks to kill goblins, one of the basilisks was killed by Ainz in a single spell. Quintia saw Ainz as some kind of reincarnation of one of the Six Gods and fled. [BTW this turned out to be fanfiction, the last part]

Aura can controll monsters/animals with level 90, so if this counted for Quintia as well Quintia would be around level 40 (unless his beast taming ability is an innate talent). Basilisks lie around level 30 since it takes a whole party of at least orichalcum adventurers to defeat one. So the only two I can think of in B.S. that cannot be defeated by Pleiades are the Captain and Zesshi.