Items from all of the following armor sets satisfy the requirements for this set bonus: * Gladiator's Redemption - season 1 * merciless Gladiator's Redemption - season 2 * Vengeful Gladiator's Redemption - season 3 * Brutal Gladiator's Redemption - season 4 As each new season advanced, each lower season was bumped down a rung in arena purchase requirements.