Unchained Aggressor is a craftable item set that can be crafted at the Bruma Armory in Cyrodiil. To be able to enter the armory, your alliance must hold Bruma.
To craft an item for this set, a crafter must have researched three traits for the particular item.
2 items: Adds 25-1096 Maximum Stamina
3 items: Adds 3-129 Stamina Recovery
4 items: Adds 3-129 Weapon and Spell Damage
5 items: After Breaking Free, gain Major Berserk for 12 seconds, increasing your damage done by 10%. This effect can occur once every 14 seconds.