Two Player Competitive Fantasy Game

You and a friend share a screen and you start out as two warriors that are destined to do battle.

One of you is moving to the right and the other one is moving to the left, Beat em up esque., eventually you two will meet in the middle to settle your great rivalry.

As you slaughter hordes of enemies you will be able to rank up your abilities and stats. However, since it's split-screen the other person can see you do this and can plan accordingly against you.

I'm not sure what console or how long I saw it. Best guess- Wii circa 2010.