Kandrakar

an ethereal realm at the center of the universe and the heart of infinity, existing beyond both time and space (though the 5 Arc finale contradicts this fact, stating that Candracar does not lie outside of time) a vast nothingness, where the most powerful spirits and creatures reside, led by the Oracle.

A brief description is that it was created in the early days of the universe to serve as a home to those whose task it was to protect creation. When the universe is threatened, the ruler of Candracar, a benevolent spirit named the Oracle summons the Guardians, whose mission it is to protect all worlds including their own.

the Chinese nymph Xin Jing of the Elements, Oneide, nymph of Life, Téa, nymph of the Sun, Ebla, nymph of the Moon and N'ghala, nymph of the Stars created Candracar. The only methods to reach it is if the Oracle summons one or the Keeper of the Heart chooses to use the Heart to transport someone there, though it seems that the Oracle must first give his permission, or even the Heart cannot bring anyone there.

Candracar is a threshold to all other universes, and if evil was to cross its magical defenses, chaos would be unleashed throughout the entire universe and evil would roam free unchecked.