Voodoo blade

You will curse your wepon for short duration of time with your words and your blood / or something like that (you can change what will ,,curse,, your wepon)

You will cast this spell on your wepon (only for light wepons), this wepon counts as magical and deal additional 1d4 (+ 1d4 for every spell level) necrotic damage with every hit untill spell end.

When you attack Undead / (target with active Voodoo curse spell casted by you) with your cursed wepon you have advantage on attack roll.