Water Ruins (水の遺跡 - mizu no iseki) are located in China, near the Old Peak Five . Rivers and waterfalls of the regions are particularly agitated. They are hidden behind the waterfall Ryuga, and Perseus Mirfak is responsible for their protection. Ryuho manages to overcome this Saint who wanted to avenge the honor of the Saints of Perseus, his predecessor having been defeated by Shiryu , the previous Dragon. However, the Cosmos Water and Earth is almost completely drained and Ryuho has the strength to go raging waterfall. His father then lends the Cloth of Libra, which opens the sword of a sudden cascade two. The Core of Water Ruins is destroyed by Cosmos Aria and Ryuho, who thus recovered a Cosmo Crystal dragon form.
- Saint Seiya Omega (debut)