Seraph Empyrean

Seraph Empyrean is one of the highest, if not the highest ranked angel type monster.

Appearance
Majestic and large stature with four feathery angel wings.

Abilities
Surpasses Principality of Observation and Archangel Flame in magic abilities. It is able to use magic greater than tier seven. It is presumably a tenth rank summon as it is the highest ranked angel in Christianity.

Trivia

 * A Seraph is a member of the First Sphere in the celestial hierarchy in Christianity. Regarded as one of the highest tiers of angels who are closest to the throne of God.
 * While none have been encountered so far, it is said by Ainz himself that he would have to fight it at full strength in order to defeat it.