Mjolnir

Mjolnir is an enchanted war-hammer used by Thor, the Asgardian God of Thunder. Forged by the Dwarves of Nidavellir, Odin briefly wielded the hammer before locking it up in his weapon vault. He later took the hammer out and gave it to his first-born son Thor, after the latter had proven himself worthy of it.

Capabilities
Mjolnir was made out of a small chunk of Uru, an extremely durable metal commonly found in Nidavellir. Along with additional spells cast upon it by Odin, the hammer is virtually immune to all manner of attacks aside from high level reality warping, molecular manipulation, or physical strength.