Hawk's Eye is an item set found in boxes bought from a merchant in Bruma or as quest rewards. Pieces are Aldmeri Dominion, Daggerfall Covenant, or Ebonheart Pact Style in Medium Armor.
2 items: Adds 25-1096 Maximum Stamina
3 items: Adds 25-1096 Maximum Stamina
4 items: Adds 3-129 Weapon Damage
5 items: Reduces the cost and increases the damage of your Bow abilities by 6%.
The set consists of medium armor and jewelry in all slots, as well as bows (other weapons and shields may still exist but cannot be obtained new anymore).