Armor of Access

You perform a ritual that is guided by your Tinker's Tools. A suit of armor that is not being worn becomes bound together with magically infused leather straps and obsidian anchors. Upon completing this spell, you imprint a command word of your choosing into the armor. After this spell is complete, all pieces of the armor are magically bound together and cannot be separated while the spell is active. Because of this, the armor can no longer be donned or doffed by traditional means. 

When an Armor of Access is unused, a creature may take a [Tooltip Not Found] action to speak the command word while within 5 feet the armor. Doing so will cause the armor to become rigid and stand up, and magically split down the center of the front and its limbs. While standing, the armor can only support its own weight, and due to it being in motion throughout this process, the armor cannot be used as cover. If the creature enters the armor, it will close and seal around them, and not open again unless the current occupant utters the command word. But if the creature does not enter the armor by the end of their turn, the armor will lose its rigidity and crumple to the ground.

The armor retains all other properties it had before becoming an Armor of Access, but gains no additional properties other than those outlined in this spell. When the spell expires, the obsidian anchors crumble and the armor can be separated naturally once again. If this spell is cast on the same armor for 7 consecutive days, the armor permanently becomes Armor of Access until dispelled.