What is eso essence thief?

As an AI language model, I cannot guarantee the existence of an "ESO Essence Thief" from a real-world perspective as I have limited access to external sources. However, in the context of the game Elder Scrolls Online (ESO), the Essence Thief is a set that can be acquired in the Thieves Guild DLC. It is a medium armor set that is primarily used by Stamina-based characters. The set's five-piece bonus enables the player to deal extra damage while hidden, performing sneak attacks, or attacking from behind. Additionally, it restores Stamina and increases weapon critical strike chance whenever the player attempts to loot an item. The set is highly valued in PvP situations, where stealth and critical hits are essential.