Overview
Key of Thief is the consumable used to open a Treasure Chest. Chests spawn at random when you kill mobs, and if you can't open one fast enough it runs away. The reward is worth it: chests drop valuable items, so most players keep a stack of keys on hand.
How to Use
When a Treasure Chest appears, click it and either use the Open Chest skill — available only to dagger classes (Treasure Hunter, Adventurer, Plains Walker) — or use a Key of Thief. The chest runs on a timer: if you don't open it within 30 seconds, it vanishes. The chest level scales with the zone it spawns in, so higher-level zones produce richer rewards.
| Method | Who can use it | Cost |
|---|---|---|
| Key of Thief | Any class | Cheap consumable (Adena) |
| Open Chest skill | Dagger classes (TH / AW / PW) | Free — no key needed |
High-level chests can drop valuable recipes, crafting materials and rare consumables, which makes them a meaningful bonus on top of normal mob drops.
Where to Get It
Key of Thief is sold by the Grocery Store NPC in any town for a small amount of Adena. If you farm mobs regularly, carry 10–20 keys at all times — chests spawn without warning, and if you're caught unprepared you'll lose the loot when the timer expires. Dagger classes can skip the keys entirely and open chests with the Open Chest skill.