The Bloodaxe was a powerful weapon forged from Uru.
It was stolen by the Dark Elves during an attack on Nidavellir. It was taken to Jotunheim, where Heimdall sent Thor and Sif to recover it. The two Asgardians discovered the Dark Elves using the Bloodaxe as part of a ritual. They successfully took it back from the Dark Elves after they defeated the monster guarding it, the giant Ymir, and went back to Asgard with the weapon in tow.