Adolmaea the Sun King (KH III:DR)

Adolmaea is the current de jure Leader of the Gatekeepers and the original de facto Leader Gatekeeper from over 10000 Years prior, due to this it is far larger and more powerful than its younger siblings being found fourth out of the original five, it was wielded by Xehanort however eventually he was rejected and the power of Adolmaea was inherited by the son of its first wielder: Magnus.