Diamonds are now rewarded for each time you kill the Wizard.
A vendor is available in the Doomed Town at the start of the game that will soon sell you rare items for diamonds!
Save up those diamonds now because you're going to be needing them very soon...
The next patch will contain limited time items to buy from the new vendor. Items will cycle througout the year; stay tuned!
PS: If you start the game and don't see the new "Doomed Town" you need to restart steam to trigger this update.