Source: PvP Daily Quests

Cost: Once you have collected 50 Gladiator’s Proofs from the Daily Quest rewards, you can purchase a Gladiator’s Recognition from the War Researcher vendor and use it to combine your proofs into a tradeable runebox that contains the fearsome Arena Gladiator costume

Tamriel’s prestigious and popular Arena Gladiators have an intimidating look all their own.

 

Thanks to MMO-Fashion for the images.