Mjolnir

Forged by the dwarves, Brokkr and Eitri, and gifted to the god of thunder, Thor. Mjolnir is a weapon of incredible power, able to level entire mountains in a single strike when wielded by one who is worthy.

In lesser hands it is still capable of summoning lightning when the rain is out, and returning to its wielder, though at a significantly reduced range and velocity. Perhaps it's best you returned it to it's true owner, no?