Devastating Onyx Bolt

You conjure your mana back into an electric surge from the bark of a lightning-stuck tree and filter it through a black gemstone, destroying it, for a devastating bolt of onyx lightning. Make a ranged spell attack within 60ft and on a hit, the target must succeed in a Dexterity saving throw or take 1d100 damage. (The target takes half on a success) on a fail, the target becomes paralyzed for 1 round.