An artifact that can be used to spawn a friendly living chest type of mob, it will hop around like mimics, basically the traveling trunk from TC4 is what I am getting at.

Friendly traveling trunk can be ordered to either sit still or follow, your friendly chest have the same inventory of a single chest, they won't fight for you else you will risk having your items being on the ground. Normal right click to open its inventory, shift right click to change the mode. These have 80 hp and immune to falling, suffocating and drowning damage. They have a regen rate equal to regen I and can be healed with wooden planks.

Won't have tamable mimics because they are evil by nature.