From Dota 2 Wiki
|Used to open locked treasures. Double click or right-click the key in your backpack and select the treasure you want to open.|
| Used By:
| Equip Slot:|
|Released||May 31, 2012 Patch|
The Treasure Key can be redeemed for following Treasures. Certain event Treasures cannot be redeemed.
- Standard Treasure Keys were converted into items that could be redeemed for unlocked, non-event Treasures.
- Unique individual keys were converted into unlocked versions of the Treasure they previously opened.