Surviving a World of Fiction

I started a new game, only to end up inside that game instead. Now, I must survive a world meant to be fiction. I must use my knowledge to save this universe, and make sure Shepard prevails. But Saren was only the beginning, and there may be a threat far worse then the Collectors or their masters. A threat that I might not be ready for. The real question is: are they ready for me?