Our Mass Effect Roleplay's version of Jupiter is comprised mostly of empty space. Deep gravity and high radiation levels leave the planet totally inhabitable. The only way that any life can exist near the planet was with the creation of orbital stations in high orbit at Lagrange points. Early on these habitats, being so far from the more civilized planets, were overtaken by the krogan and, to a lesser degree, vorcha. Warring clans occupy different moons, breeding at a high rate now that the genophage has been lifted and needing more and more space constantly to support their clans as they get larger. With their lack of engineering the stations face premature depredation, leaving it's already enraged inhabitants eager to find new land to settle upon, and willing to use hostile means to gain it.
