Treasure

Treasures can be opened to find cosmetic items or sets. Treasures are obtained through the Dota 2 Store, charms, or the item drop system. Each treasure can be opened once to receive one or more items from its listed contents.

Rarity Tiers
Each treasure comes with a list of Standard drops, as well as Very Rare drop(s). Some treasures also contain Extremely Rare drop(s), often an courier, which occur at approximately 1-2% chance. Item rarity does affect drop chances.

Duplicates
Opening several of the same type of treasure (that is, the same item ID, e.g. 50 - Treasure of Sinister Arcanery) will guarantee that a different item will be received each time; for example, if you receive a Robes of the Heretic item from a Treasure of Sinister Arcanery, all subsequent Treasures of the Sinister Arcanery you open will not contain a Robes of the Heretic, until you have opened enough iterations of it to obtain every item on its droplist - in that event, opening more such treasures will produce items from its full normal droplist at random, as though you hadn't opened any. This guarantees that, if you wish to obtain every item from a treasure, you need only open as many chests as there are items in its droplist (for the Treasure of Sinister Arcanery, that would be four times).

These rules do not apply to a treasure's Very Rare or Extremely Rare drops. Each treasure opened has an independent chance to award these items, if applicable.

Multiple Drops
Some treasures, such as 37 - Ancient Scroll Case, always drop multiple items.

Trade Restriction
Items unboxed from treasures cannot be traded or marketed for three months. However, restricted items can be gifted once to a friend. This restriction does not apply to Extremely Rare drops.