The Omega Saints are those who managed to awaken the ultimate Cosmo, which lies beyond the 7th sense. There are several levels of the Omega.
OmegaThe first level of Omega is mostly referred to as a doorstep to Omega, as it greatly increases the durability of the Cloth, and adds slightly differences on the Cloth's design. Koga, Souma, Ryuho, Yuna, Haruto and Eden awoke this level of Omega during their battle against Gallia. As long as they're in the Omega Cosmo, several changes in their Cloths are seen: Koga receives wings, Souma and Haruto receives claws on their feet, Yuna's wings spread more out, Ryuho receives a whip from his shield, and Eden receives a thunder-like coat. This Cosmo allowed the Bronze Saints to defeat Gallia, however, they were no match for Hyperion, the strongest Class 1-Pallasite who easily destroyed their Bronze Cloths, leaving them. Refusing to stand down and accept defeat, they kept standing up, burning their Cosmo in order to defeat their enemy.
Ultimate OmegaAs they kept burning their Cosmo, and Hyperion was about to kill Subaru, the Bronze Saints gathered their Cosmo and awoke the Macro Cosmo. As such, they were given the Omega Cloths, which was far more powerful than even a Gold Cloth. These Cloths look similar to the God Cloths, but they are totally different. Each of the Omega Cloths have large wings and golden inlays. With these Cloths they were able to defeat Hyperion at last, before making way to the throne room of Pallas. However, these Cloths also met their demise by Saturn.