Rheic II is a massive, ice giant with four distinct layers on an iron-nickel core.
The thick upper atmosphere is dominated by hydrogen, helium, and methane, with constant high speed winds and massive storm systems.
The lower atmosphere and transition zone consist of cloud layers of frozen methane and ammonia ice, where atmospheric pressure rapidly increases with depth.
The center one-third is composed of a thick, frozen ice crust fractured by deep fissures and cryovolcanic activity, often resulting in colossal plumes of supercooled vapor venting into space.
The final layer before the core is a supercritical ocean—a dense, high-pressure ammonia-water mixture. Intense heat flux and gravitational forces cause glaciers of superionic ice to form, collide, and melt in an unending cycle.
Sometime before the 2410s, the planet became the designated site for the Eternal Gallery and Archive. The space station made the treacherous descent down into the planet’s ocean layer and anchored itself to the underside of an ice continent, thusly requiring any visitors to the Archive to do the same in order to access its vaunted collection.
