Dawnbreaker is a Daedric artifact created by the Daedric Prince Meridia. It was forged "in a holy light that breaks upon" the Prince's foes. In appearance it is an ebony longsword, with a distinctive cross-guard that emanates light. It was created with the intention of "burning away corruption and false life". As such, it is particularly effective against Meridia's "foes": this primarily applies to the undead, although its powers can also be used on Daedra and werewolves. Dawnbreaker is known to deal magical or fire damage to those it strikes, along with additional damage to the Prince's foes, sometimes knocking them to the ground. When an undead creature is killed by the weapon, there is a chance that it will cause a fiery explosion, burning all other undead in its radius and causing them to flee. This explosion can prove dangerous if the wielder is also undead, such as a vampire. Those who possess Dawnbreaker are sometimes known to do more damage with mundane weapons.
During the time of the Planemeld, the Fighters Guild was commissioned to destroy Dark Anchors sent to Tamriel by Molag Bal. The highest ranking members were given the power to summon Dawnbreaker in the midst of battle to aid them in fulfilling this contract. At some point, Dawnbreaker was brought to Meridia's temple at Mount Kilkreath in Skyrim. In 4E 201, a Breton necromancer named Malkoran defiled the temple, and began trapping the souls of dead soldiers in the ongoing Stormcloak Rebellion. He used Dawnbreaker's power to fuel his profane magic, which greatly offended the Prince. In response, Meridia summoned the Last Dragonborn to Mount Kilkreath to cleanse the temple ruins and claim Dawnbreaker.