Basically this super cool tech that lets you travel from one side of the galaxy to another in a manner of minutes. You guys ended up finding one right at the edge of your Solar System after studying some Prothean ruins on Mars.

[ he'll avoid mentioning the whole built by the Reapers thing for now... ]

That's about 150 years or so out from where you came from. Or... I guess it would be if it weren't for that whole Storm thing...

[ it's a real shame, ok? ]