Dawn Shard Longsword 2014
Weapon, uncommon, (requires attunement)
The blade of this magic weapon gleams with a faint golden shine, and the pommel is etched with a sunburst. As a bonus action, you can command the weapon to shed dim light out to 5 feet, to shed bright light out to 20 feet and dim light for an additional 20 feet, or to douse the light. The weapon deals an extra 1d6 radiant damage to any creature it hits. This increases to 2d6 radiant damage if the target is undead or a creature of shadow.
Properties
Versatile (1d10)
This weapon can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack.
Source: Vault of Magic (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details