Out of the Abyss
Lost for ages in the Underdark, Dawnbringer appears to be a gilded longsword hilt. While grasping the hilt, you can use a bonus action to make a blade of pure radiance spring from the hilt, or cause the blade to disappear. While the blade exists, this magic longsword has the finesse property. If you are proficient with shortswords or longswords, you are proficient with Dawnbringer.
You gain a +2 bonus to attack and damage rolls made with Dawnbringer, which deals radiant damage instead of slashing damage. When you hit an undead with it, that target takes an extra 1d8 radiant damage.
The sword’s luminous blade emits bright light in a 15-foot radius and dim light for an additional 15 feet. The light is sunlight. While the blade persists, you can use an action to expand or reduce its radius of bright and dim light by 5 feet each, to a maximum of 30 feet each or a minimum of 10 feet each.
Alignment: Neutral good
Senses: Hearing and darkvision out to a range of 120 feet
Languages: Can speak, read, and understand common, and it can communicate with its wielder telepathically. Its voice is kind and feminine. It knows every language you know while you’re attuned to it.
Forged by ancient sun worshipers, Dawnbringer is meant to bring light into darkness and to fight creatures of darkness. It is kind and compassionate to those in need, but fierce and destructive to its enemies.