chestmonsters

Not sleeping for a long time will summon chest monsters that spawn when you open a chest. These mobs will look like zombies but have a chest instead of a head. sometimes they will take off their head to bite you or summon in chest minions that jump around and bite you. Upon killing it you will receive all items taken from the chest by the chest monster that it used to fight you with and the living chest which you can use as transportable storage and automatic defence/ offence but not simultaneously. Alternatively, put a living chest in achest to summon the chest monster.