Hand of Rathmore
From WikiRaider
The Hand of Rathmore is the fifth artefact for which Lara is looking in the adventure Lost Artefact. Sophia Leigh used this while fighting Lara in the level Reunion. It was a secret fifth crystal artefact, fashioned from the same meteorite from Tomb Raider III. It's unknown if it has any relation to activating the meteorite in the Meteorite Cavern.
Powers
The individual powers of the Hand of Rathmore are unknown.
Considering the elementalist beliefs of its creators, the Hand of Rathmore should symbolize the Fifth Element, as the other artefacts symbolize the elements Fire, Water, Air, and Earth.