Ippen is a large gas giant. Unique to most gas giants it the fact that the planet is mostly composed of oxygen and nitrogen making it breathable to most living creatures. It looks like a giant floating sky of blue and white when inside of the planet. The keliouxians have built floating cities that are suspended by anti-gravity engines that cause them to float in endless sky. Sometimes there are large wind storms on the surface that make flying almost impossible and the keliouxians are forced to hide within their floating cities.

To be on Ippen one must know Bukujutsu.

Ippen large size gives it a huge gravity well thus making the natural gravity of the planet x10.