A new article just game out from Game Informer that said this: [quote]Here’s how it works. Upgrading exotic weapons and armor is completed by interacting with the weekend vendor, Xur. When he arrives every Friday morning, he will now have a new option to upgrade one of your equipped exotic items. Each week, he’ll offer some (but not all) exotic items as being available to upgrade. You’ll need three things. First, you need to own the original version of that exotic item, and turn it in to exchange for the upgraded version. It doesn't matter if this old version of the item is brand new or fully upgraded. To complete the upgrade, you’ll also need to turn in an exotic shard. This recently introduced new material is available for purchase for seven strange coins from Xur, or by breaking down another existing exotic item in your inventory. Finally, each exotic upgrade costs a hefty dose of cash – around 7000 glimmer as of my playthrough of the expansion in mid-November. After turning all three of these things into Xur, he’ll hand you a brand new version of your item with a higher defense or attack value cap.[/quote] So for the next week if you upgrade your exoctic weapons you will just have to do it all over again. I would like to know if this applies to the Mythoclast, or if it is already "upgraded." Also before next Friday make sure you have haxed glimmer, and you may want to arrest gaining faction reputation while you are at it because: [quote]Independent of raid loot, there are some new wrinkles involved in acquiring standard expansion-tier legendary gear. In addition to spending crucible or vanguard marks, buying new purple items now requires that you gain crucible or vanguard commendations. This reward is provided when you hit a new reputation level, and arrives via the postmaster. New legendary gear can be purchased by any Destiny player, regardless of whether you own The Dark Below.[/quote]