The chest is a structure that allow players to store an infinite amount of a particular item. Chests are also used for exchange between players. Chests are really useful mid-game where players still need lots of different resources but don't have the inventory space to carry them.
Lock and Key
Players can use locks and keys to protect a chest. When the chest is locked, players can still break it and any items inside will disappear, just like a normal chest. To remove a lock, a key is required. When a key is used on a lock, both the lock and the key are destroyed, granting free reign over the chest. The person that locked the chest can access the chest without keys.