Ascendant Tempest

Crackling lightning surrounds your form, imbuing you with enhanced speed and reflexes. For the duration of the spell, your movement speed increases by 10ft, your Dexterity score increases by 1 to a maximum of 24, and you do not invoke attacks of opportunity against you.

As a bonus action, you can expend all bonuses granted by this spell to slice the air, causing it to reverberate and form a bolt of lightning that strikes from above. Choose a creature within 60 feet of you and make a ranged spell attack against it. On a hit, the target takes 8d6 lightning damage.