Equestria is the source of a lot of magical happenings. But when two Spartan supersoldiers on the run from their own species show up, what will be unearthed about Equestria's past?

Rated Teen for cursing, and implied sex

Major alternate universe for Halo, be warned. Has to do with a new/old Spartan program, and I know how those can be seen as bad.
Crossover between My Little Pony, Halo, and Bionicle. RWBY and Red vs. Blue don't appear until later in the story, and only O.C. and minor characters appear from both.