Eye of Isis
From WikiRaider
The Eye of Isis is one of the crystal artefacts in Tomb Raider III. It is in the possession of Sophia Leigh.
Lara travels to London to find Sophia and take the artefact from her.
From your encounter with Sophia, the artefact seems to grant its user invulnerability from various attacks (although not electricity) and the ability to fire some kind of green energy bolts. A conversation at the end of Thames Wharf also suggests that it grants eternal life (although this may be because of Sophia's cosmetic experiments rather than the artifact).
