Five Rulers

Five Rulers were a group of bosses that originally inhabited the Great Tomb of Nazarick before it was conquered by Ainz Ooal Gown.

Background
The Five Rulers were five powerful monsters that were designated by the Lord of Helheim to protect the five zones of the Great Tomb of Nazarick.

Overlord Prologue Arc
The Five Rulers faced off against the newly created guild, Ainz Ooal Gown. However, all six teams of the guild successfully defeated each of the bosses. Due to the guild's success in conquering the dungeon on the first time, they were awarded the rights to the Great Tomb of Nazarick.

Strength
The bosses encountered by the members of Ainz Ooal Gown noted that they had different abilities, appearances, and boss rooms to fight each of them in.

Members

 * Pure White Bat: This monster guarded the Underground Lake Floor.
 * Dragon: This monster guarded the Volcanic Floor.
 * Asura: This monster guarded the Tombstone Floor.

Trivia

 * Though only each of the five bosses guarded a floor, there was a sixth floor where players needed to reach to in order to complete the raid.
 * After Ainz Ooal Gown conquered the dungeon, it is unknown what became of the bosses.