Simply enter the code 5MUSERS to redeem yours!
Additionally, the Spring Event is also underway in Drakensang Online, letting all of the heroes of Duria get into the mood of the coming season. The Spring Event will provide you with numerous events in which to partake as well as plenty of eggs to be found.
The Drakensang Online Spring Event is already underway and will be going until April 9th, so make sure to partake in the fun while it lasts!
Source: Game homepage