Aphelion, bd

Not all moons are exactly like Lunas which orbits its gas giant, Xeon. Of all the moons that this gas giant has in its company, Lunas is the only one having life. However, this world holds a dark past. At one time, people from Earth found this world and began to colonise it in hope of making a new future for themselves, far removed from the rest of humanity. But mankind now returns to this world with a new objective to fulfil with their return. Buried and hidden within a valley is a power that man wants to exploit, waiting to be unearthed.
It has been two years since humanity was defeated by a mysterious alien force. It leaves Earth weakened and in need for replenishing its forces. The interest to unearth this power and obtain it has increased in order to accomplish this task. However, also hidden on Lunas are vicious monsters that desire to stop this from happening at any cost. They stop at nothing to drive humans out. How far will mankind go to prevent this threat and will this be enough to achieve their goal?