Back when Encantadia was a young world, there was a great empire called Etheria, ruled by Reyna Avria, who wanted to control the neighboring kingdoms of Lireo, Sapiro, Adamya and Hathoria. However, the four kingdoms banded together and attempted to defeat the forces of Etheria in the Great Encantadian War. After Etheria had fallen, Avria swore that Etheria would return to power once the last Sang'gre is born. The prophecy was then fulfilled due to the birth of Cassandra. Etheria rose again from the ashes and in order to save the present, the four Sang'gres of Lireo travelled back to the past in ancient Encantadia, find the lost Sang'gre, and destroy the Golden Clock (Etheria's powerful weapon) to stop Avria's centuries-old plan to dominate the realm. (Source: Wikipedia)