Yarasasi

Yarasasi (ヤラサシ（大蝙蝠洞） Yarasashi (Ōkōmori-dō)) is a cave located in an unknown location, as well as the secret hideout of Mezar, a Dark Mage responsible for the revival of Acnologia.

Trivia

 * "Yarasası" is Turkish for "bat".