Artifact unaligned pair of lenses The Lens of Truth (or Lenses to avoid oddity), from Zelda, which grants see invisible when worn. Also, while wearing them, you must tell the truth, which primarily affects interacting with vault guards and could be implemented as any of the following:

• You will auto-reply to vault guards with your real name rather than being given the opportunity to lie.
• You are prompted “Give your name?” so you can remain silent.
• You are penalized for lying, much more harshly than losing an alignment point.