Aelius

Aelius (アエリウス) is one of the five overlords that guard the library, Ashurbanipal of the Great Tomb of Nazarick.

The Two Leaders Arc
Aelius along with his fellow Overlords: Aurelius, Cocceius, Fulvius and Ulpius escorted Mare to the lizardmen village to search for Cocytus.

Abilities and Powers
Considering the fact that he is an overlord, he must be at least level 80.

Trivia

 * His name is based on a Roman Emperor.