Isle of the Citadel Ruins

The Isle of the Citadel Ruins, also known as The Master's Citadel, is a location of the My Little Skylanders series created by Lauren Faust and Eric Rogers. It is a remote location in Skylands that contains some of its greatest secrets, including the Core of Light, that are essential to the very existence of the universe.

It is what remained of the citadel that surrounded the Core of Light after it and its castle was destroyed in the battle between Princess Celestia and Nightmare Moon, and it was the main headquarters for Portal Masters and the Skylanders. As each of the components of the Core of Light is restored, the Citadel Ruins will gradually change in appearance, becoming more lush and vibrant. The path to the Core of Light appears to warp the island's appearance as those who conquer its trials advance through doors, seemingly sending them to other identical locations or to the skies above.

"."
 * —About the Isle of the Citadel Ruins.

Current

 * Arbo
 * Auric
 * Chronobones
 * Clam-tron 4000
 * Dale
 * Diggs
 * General Robot
 * Gurglefin
 * Leo
 * Madeline
 * Nattybumpo
 * Quigley
 * T-Bone
 * Weapon Master
 * Sheeps

Former

 * Cali
 * Princess Celestia
 * Master Eon
 * Flynn
 * Kaos' Mom
 * King Pen
 * Hugo
 * Princess Luna
 * Persephone
 * Wizbit

Early Life
It was built by the previous Portal Masters long before the Great War where they, Celestia, and Luna lived in solitude to think about what to do next to protect Skylands.

Eventually a thousand years prior to the beginning of the series, most of the inhabitants (including Princess Celestia) left the citadel hidden under a shroud of strong magic, with machinery to move it when its location is discovered.