The listing, Magicka: Wizard Wars Daft Robe Exclusive! steam key - PC has ended.
This code is a Steam key, which means you redeem it just like any Steam game or DLC – even if you already have the game installed
1. Launch Steam (or download and install Steam if you’ve not got it already)
2. Click “Games” from the menu bar at the top of the Steam client, then select “Activate a product on Steam”
3. Follow on-screen instructions to redeem Steam key
4. After redemption, Steam will automatically download and install the Daft Robe as a piece of DLC (and if you don’t have the game, it’ll download and install that first)