Eye of Odin

Eye of Odin is an unused artifact from the Tomb Raider: Underworld story concept.

History
Eye of Odin is an artifact that can possess the person it attaches to. It resembles a metallic snake that wraps around person's neck and head, possessing them and giving supernatural powers. It at one point attached itself to Jessica, which lead Lara Croft to seek a way to release the girl, and a way to use it's powers herself.