Frion is the home planet of the Cryocardians.
Frion is a planet which has a very eccentric orbit around its star, and because of this the temperatures on the planet are very low most of the time, but Frion heats up once it approaches the star. This led to the Cryocardians to evolve and gain cold blood to collectively freeze the planet while it is scorching.
Frion has unknown history and minimal data.
Frion is a play on frio, which is Spanish for "cold".