Weapon (scimitar), very rare (requires attunement by a paladin)
This decorated saber glimmers even when nothing is shining on it. You gain a +2 bonus to attack and damage rolls made with this magic weapon. While you're attuned to it, you have resistance to radiant damage.
Sunslash. Once on each of your turns when you hit a creature with an attack using this weapon and either expend a spell slot to use your Divine Smite feature or deal damage to the target with a spell that has "smite" in the name, you can choose for the weapon to also emit a 30-foot cone of sweeping bright sunlight in the direction of the attacked target. Each hostile creature within that cone of light must then succeed on a DC 15 Constitution saving throw or take 3d6 radiant damage from the effect. Undead, fiends, and creatures with the Sunlight Sensitivity trait (or similar) make the saving throw with disadvantage.
"Feel the wrath of the sun's divine light! Begone, evil!"