Vault

The vault is a unique room. It stores mined Gold, and serves as the universal drop-off point for all Resources. It's size is fixed at 3x3 for normal dungeons, and every Dungeon starts with one. Though it cannot be sold or moved, it can be upgraded.

The vault in the Heart of the Mountain is much larger. It is 17 tiles in size, and the upgrades take up one of those tiles leaving 16 tiles for furniture or gold stacks.

Daily Chest
The Daily Chest is a chest which appears in the vault of the main dungeon when the player logs in the first time in a day. The chest is available after level 10 and contains different random resources.

Approved Daily Chest content :

Vault upgrades
Benefits of increasing level replace the previous level and stack with the bonus from tiles.