Mortac

Mortac, originally the satellites of Titan and Rhea, is the sole remaining moon of Isolation.

Features
Mortac is a hellish amalgamation of ice and fire. Many eons ago, Isolation's two largest moons Rhea and Titan collided, leaving behind only a single moon trapped within a massive inferno. Any colonies that were on Titan or Rhea before the collision never survived the cataclysm, and there are no known human occupants on Mortac.