Key

A key is an item that can be used to unlock a chest. Keys can be used only once to open chests with a matching name. They can be purchased from merchants, obtained as loot, or (in some cases) obtained from reward trophy collectors (e.g. Equipment Requisitions).

The costs of keys, and the value of the loot they unlock, varies with the difficulty of the region in which they are used. However, the merchant value of chest contents is almost always less than that of the key itself.

Each use of a key costing at least contributes one point to the Treasure Hunter title. Luxon and Kurzick keys which are bought from Faction merchants also count towards the title.

Trivia

 * Locked chests and keys were added to Guild Wars to reduce chest farming. The original release included chests that could be opened for free and had a fixed spawning location.
 * Pre-Searing Ascalon is the only region of the game that retains a chest-like container from the old system: Hidden Stashes can be opened without keys.