Items from all of the following armor sets satisfy the requirements for this set bonus: * Savage Gladiator's Vindication - season 5 (low) * Hateful Gladiator's Vindication - season 5 (medium) * Deadly Gladiator's Vindication - season 5 (high) * Furious Gladiator's Vindication - season 6 * Relentless Gladiator's Vindication - season 7 * Wrathful Gladiator's Vindication - season 8 As each new season advanced, each lower season was bumped down a rung in arena purchase requirements.