Orbis

Orbis is a world that sits in a dual star solar system, having the power of two suns can make your world, but can also cause disasters that wipe everything out.   From sunladen fertile lands within the tropics, to poles that have covered the seas in ice for more than the last two thousand years.   With such a large mass on this world, gravity has twice the power from other worlds, but only to those who don't have the powers of the crystallo.