Dawnbringer

Requires Attunement by a non-evil creature
This item appears to be a longsword hilt.
While grasping the hilt, you can use a bonus
action to cause a blade of pure radiance to spring
into existence, or make the blade 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.