Gladiator can't fight in the arena or tavern?

[Nate]

This means you need to go to the skills screen and respec your gladiator and then press the ACCEPT button at the bottom of the page. Once you do that you'll be good to go! For more info please check out the release notes here:

http://forum.pitofwar.com/showthread.php?1684-New-Update-1-12-2013!-New-Skill-Trees!

Good luck in the Pit!

-Nate-