Kvatch Gladiator is a craftable set. When your target is under 25% Health, add 1800 Weapon Damage to your Light and Heavy Attacks.
Kvatch Gladiator is part of the Dark Brotherhood DLC. The crafting station is located in Gold Coast (Marja's Mill). You can craft any armor, weapon or jewelry of this set in any motif style you know, as long as you have 5 traits researched (per item). You can trade crafted pieces to other players. Each set item becomes bound on equip.