No seal or key is needed to open this treasure, as it is already unlocked. Within its confines lie treasures without equal.
This item was given out to owners of The International Compendium 2014. It does not require a key to open.
Very Rare Bonus
Extremely Rare Bonus
Right when it was released, the Immortal Strongbox did not award any users with rare bonuses. This was quickly fixed and rewards were distributed to some users based on the probability of receiving either of these items.