The Gladiator is a divination card. A set of five can be exchanged for a random unique Nightmare Bascinet.It is not know if the rewards have uneven distribution like Emperor's Luck, though it is likely given that the droprate of The Bringer of Rain and Devoto's Devotion were reversed in The Awakening
Drop restrictions:
Daresso's Dream
The Grand Arena
Arena Map
Colosseum Map
Pit Map