This is a battle that took place about 200 years ago, and was called the Battle of Regret by the elves. In the history of Oruhis, the powerful and noble elves played an important role in every era. They often lead and resist the invasion of the Black Tide from the Demon Realm. During the invasion of the Black Tide in the Second, Third and Fourth Eras, countless elves fell under the craze of the Black Tide, making the entire race of the elves begin to decline.