Moonbow

Source: Unearthed Arcana 29 - Warlock & Wizard
Prerequisite: The Archfey patron, Pact of the Blade feature

You can create a longbow using your Pact of the Blade feature. When you draw back its string and fire, it creates an arrow of white wood, which vanishes after 1 minute. You have advantage on attack rolls against lycanthropes with the bow. When you hit a creature with it, you can expend a spell slot to deal an additional 2d8 radiant damage to the target per spell level.