After you've placed the order, we assign a PRO player with Deathy item in his inventory. He works according to the agreed schedule and will contact you in-game to trade you Deathy.
As soon as you receive Deathy you can learn it from your inventory, and it will become available to all the characters on your account. If Deathy is the Blizzcon promotion code, you will receive a digital code to redeem at your battle.net account page.