(This is my first SCP so please, don't be afraid to be harsh)
This SCP resembles a suit of medieval armour that is capable of teleportation and seeks to always escape confinement. It is capable of trapping humans inside of it without harming them for use as hostages to negotiate release. Although it is harmless, it doesn't like being contained.
While it has some semblance of consciousness, it does not appear to be very intelligent, being easily fooled and recaptured, should it escape
I thought it would be a good play on the cliché of a haunted suit of armour but viewed from a more scientific/analytical angle. It is intended to play on more primal fears of ghosts and the undead but without the associated violence and physical threat.
If you want to see the full draft, let me know