Mjölnir

In Norse mythology, Mjölnir (pron.: MYOL-n(ee)r; also Mjǫlnir, Mjollnir, jölner or Mjølner) is the hammer of Thor, the Norse god of thunder. Distinctively shaped, Mjölnir is depicted in Norse mythology as one of the most fearsome weapons, capable of leveling mountains. Though generally recognized and depicted as a hammer, Mjölnir is actually an axe or club but misconceived as a hammer. In the 13th century Prose Edda, Snorri Sturluson relates that the Svartálfar Sindri, the brother of Brokkr, made Mjölnir while in a contest with Loki to see who could make the most wonderful and useful items for the Gods and Goddesses in Asgard

It is an important piece of equipment and weapon used by Lara Croft in Tomb Raider: Underworld.

Powers
The user that waves the hammer can harness lightning