Transmogrification

Transmog is a system coming to Diablo 3 in the expansion Reaper of Souls. It's taken directly from the popular system of the same name in World of Warcraft, and enables characters to change the appearance (but not the function) of their gear. The Mystic NPC Artisan is the place to go to get some transmog on in D3X.

Transmog will function entirely via the Mystic NPC, and it will work much like the Jeweler and Blacksmith work; some recipes (for different transmog looks) will be enabled by training the Mystic to higher levels, and other transmog looks will be enabled by other means. Details have not yet been released, but Blizzard has hinted that new looks might be unlocked via finding items in the game, or by in-game accomplishments (possibly tied to Achievements, or by finding Transmog plans to teach the Mystic new recipes. There might even be special, limited-edition transmog appearances given away in contests, in Blizzcon goodie bags, etc.

• More details on Transmog are expected at Blizzcon 2013.

Blizzard Comments on Transmog

Transmog was mentioned briefly in a number of interviews from Gamescom 2013, but details were very sparse. In early September 2013 more details came from a forum post by CM Grimiku.[1]

Are we gonna need the gear we want our current gear to look like in our stash or there will be a void storage? or is there going to be a full list of all items you have acquired at least once, even if you dont have it anymore that you can choose from?
Grimiku: We know inventory space is precious, so you won’t be required to keep the “visual” item in order to use it’s appearance. Instead, you’ll unlock the item’s appearance across all Normal (or Hardcore) characters on the account once you’ve picked it up. Any item appearance that’s been unlocked will be stored in the transmogrification UI.