How do I unlock the druid and druid arena in wwe Smackdown vs raw 2011?

To unlock the Druid character and the Druid Arena in WWE Smackdown vs. Raw 2011, you need to complete the Road to WrestleMania mode. Specifically, you must finish the storyline involving The Undertaker. After completing this storyline, the Druid character and the Druid Arena will become available for use in the game.