Master Mage

You have a number of d4 Prowess Dice equal to your Proficiency Bonus, and regain any expended dice when you finish a Long Rest. Whenever you cast a level 1+ spell, you can expend one of your Prowess Dice, roll it, and cause one of the following effects of your choice to happen before you cast the spell.

Batter. You reduce the AC of one of the spell’s targets by the number rolled until the start of your next turn.

Nexus. You increase the level at which you cast the spell equal to the number rolled (to a maximum of level 9).

Travel. You teleport up to a number of feet equal to 5 times the number rolled to an unoccupied space you can see.