Eight Dragons

Eight Dragons are a group of dragon bosses from YGGDRASIL.

Background
The Eight Dragons are among the World Enemies created by YGGDRASIL developers for groups of players to encounter and face in battle.

The Dark Warrior Arc
During a discussion with the Swords of Darkness, Ninya brought up the likelihood of them facing dragons. However, her companions thought that scenario to be impossible as the chances of an encounter with dragons were very low. Still, it reminded Ainz about the World Enemies from YGGDRASIL that he know of were dragons. Such beings are said to be the Eight Dragons who are classified as World Enemies.

Strength
Eight Dragons have the power to induce breath attacks like any other dragons out there. Since they are on the level of World Enemies, these breath attacks of theirs are possibly far superior to ordinary dragons. For instance, the ‘Corpse Venom Breath’ exhaled by one of the Eight Dragons looks to be toxic in nature.

Trivia

 * The Eight Dragons were likely made as World Enemies due to the developer team’s love and appreciation of dragons.