The Elder Scrolls: Tamriel real

This item appears as a longsword hilt. As a bonus action, you can summon or dismiss a radiant blade. While active, it has the finesse property and grants a +2 bonus to attack and damage rolls, dealing radiant instead of slashing damage. Undead take an extra 1d8 radiant damage. It emits sunlight—bright light in a 15-ft. radius, dim light for 15 more. You can use an action to adjust the light range by 5 ft., between 10–30 ft. for both bright and dim light.