Derpy Hooves is a simple pony from ponyville who is always looking to have fun and adventure. So one day she is surprised to find Twilight Sparkle appear at her door offering her what could possibly the chance of a life time.

Master chief, a soldier, a legend. Having just defeated the Didact, he should be dead after all a HAVOC mine detonating in your face will do that but he didn't die he was saved by Cortana but she couldn't stay with him, she had essentially died.