Mjollnir

Mjollnir is an artifact; it is a reference to the hammer of Norse lore. It is a hammer for skill purposes. It does lightning damage, which few monsters are immune to.

Mjollnir is the first artifact Valkyries receive upon sacrificing at an altar. If a Valkyrie is wearing gauntlets of power while wielding Mjollnir, she can throw it at enemies like a ranged weapon and it will usually return to her hand.