Recovered Elements in the Elements series.
Not another Halo crossover plea- oh fine. *clears throat*
Presenting the LAST Halo/MLP crossover anyPONY will ever write(for now at least) and one I do hope you find entertaining. Real description begins now:

Second chances. We all need one now and then right? But in the wake of the war with the Covenant, the UNSC is anything but forgiving. No one knows this more right now than Captain Christopher Chase. Chase has a reason for doing what he did, one that may be exactly what humanity needs right now. But when it's discovered the Insurrectionists have taken over the Eridanus system, Chase must deal with the consequences of his actions, regardless of reason and stop humanity from tearing itself apart. In a galaxy in the grips of fear where all a captain really needs is a shot at redemption, most folks are more than happy to just say, "Screw you and the horse you rode in on." Most folks anyways.

The Galactic Republic and the Sith Empire's war rages throughout the galaxy. Countless neutral factions, planets and entire civilizations are swallowed up by either side or destroyed in the violence they spread. The Force Mystics of the neutral planet Voss have made a shocking discovery and have invited representatives of both the Republic and the Empire to their planet to discuss its ramifications. In a galaxy divided between darkness and light, a new power is about to enter the fray, one which may change the outcome of the war forever...

Nathan Sheffield never considered himself to be that fortunate at anything but when he finds the perfect gift for his girlfriend's birthday, he starts to think his luck has changed. Little does he know that the gift he just bought is about to turn his world upside down and send him on a quest to save two worlds from an evil force that wants to control it.