..... And it gives you the other specializations. Not trying to be a dick, but what don't you understand?
im only like lvl 26 and have had it since release date. im not that into it so i had no idea what was going on.
When you hit 50, you can pick a Specialization to go through ten more levels and unlock more stuff. Unless you got the Limited Edition, you only have 2 specializations to choose from. The code gets you 6 more.
XBL GT: ShAd0wF1AmE (that's a zero in ShAd0w, not an O)