Thunder Ruins (雷の ​​遺跡 - kaminari no iseki) are in an unfamiliar area, near a lake strangely circular, like a crater. They are protected by Boötes Bayer, Camelopardalis Bartsch and Whale Menkar . In addition, Eden also joins them to keep close the core, along with Aria, who is she came in the hope of destroying it. The core of the Thunder Ruins obscures the region and causes thunderstorms. Kōga and Eden confront each other while Shaina and Aria caring Core. The Core Of Thunder Ruins is destroyed by Cosmos Lightning Shaina.Eden which retrieves the Crystal Cosmo, which takes the form of a muscular man (Orion).