Daybreaker

Daybreaker was a sword forged at the Celestial Citadel from the metals of the Dream Star. It had the ability to repel darkness and act as a source of light for the wielder. In battle, Daybreaker's light could intensify and turn into a blinding ray of light, and its white-hot blade could cut through nearly any material. Daybreaker was forged to be used in the War of the Three, after which it became a family heirloom among the Brightskin Tribes.

Eventually Daybreaker was stolen from the Brightskin Tribes by Vash, who fused it together with Nightbringer in order to forge the Godslayer.