Assassin's Guile is one of the craftable sets providing special bonuses to armor and weapons. It is available for crafting to players pursuing blacksmithing, clothing and/or woodworking professions. The special crafting site dedicated to creation of this set is available on Vvardenfell.
2 items: Adds 9-833 Spell Critical
3 items: Adds 9-833 Weapon Critical
4 items: Adds 1-129 Spell Damage
4 items: Adds 1-129 Weapon Damage
5 items: Increases the duration of your alchemical poisons by 4 seconds.