Eight Greed Kings

Eight Greed Kings (八欲王) are legendary figures in the New World, who appeared five hundred years ago and conquered the world with incredible power.

Background
Five hundred years ago, the Eight Greed Kings appeared and sought to conquer the whole world. However, their rule was short-lived due to an internal conflict which led them to self-destruction. Nowadays, most of the things they constructed are destroyed, leaving only ruins. The only city left standing is under their floating castle, Eryuentiu.

Strength
The Eight Greed Kings were known to be extremely powerful, as they have slain most of the Dragon Lords in battle. They left behind the Eight Great Weapons, including their guild weapon (sword). Evileye mentioned their item "Nameless Spellbook" to be worth the price of a single world, so it may be a World Class Item. The floating castle, Eryuentiu was a city guarded by thirty guards equipped with very powerful magical weapons. Fluder stated that if he had a magic item from the Eight Greed Kings, he was certain that his Magic skills would rise by another level. As it will never fall into the wrong hands of others, the only exception being the few items are for the Thirteen Heroes who were permitted to take with them.

Trivia

 * Eight Greed Kings are the second YGGDRASIL players to be transported to the New World after the Six Great Gods and before the two players of the Thirteen Heroes.
 * It is certain that they are YGGDRASIL players, as their city produces items which only existed in Earth, like suit or katana, and they owned a guild weapon.
 * Also, in web novel, it is confirmed that they can revive after death, though they become weaker and weaker after repeating the revival. It might be due to the revival penalty of YGGDRASIL.
 * It's said that if the Eight Greed Kings didn't try to dominate the world, humanity would have already been annihilate by the stronger races.
 * Brain Unglaus got his katana from their city.
 * It is possible that Ainz knew the Eight Greed Kings and their floating castle back in YGGDRASIL but is unsure whether or not they are the same figures that came to the New World, 500 years before him.
 * Their weapons are currently in Platinum Dragon Lord's possession.