Does anypony know of a crossover story involving halo(like the game halo)

Hi everpony, as you well know I'm looking for a crossover story involving Halo. Why, is probably what a lot of you ponies are asking yourself, Well I was searching for stories involving Fluttershy, but I came across this one story that involved halo, but it was incomplete and hasn't been updated for quiet some time and I would like to read one that's pretty long. So if you know of any good mlp/halo crossover, please don't hesitate to pm me, all efforts will be greatly appreciated