Exhaustive Magic

Whenever you cast a spell, you can use a bonus action (or an action if the spell is a bonus action spell) to enhance the effect of the spell, at the cost of Exhaustion. You may:

-Maximize the damage or healing done by the spell.

-Give yourself advantage to a spell attack roll.

-Give the target disadvantage to their saving throw.

-Add a die of damage or healing to what the spell normally offers.

-Only if the player is out of spell slots, they may cast a spell that they know without using one. The spell must be at the lowest level it can be cast at, and the Exhaustion cost for this enhancement is 2/3 the level of the spell cast, rounded down, minimum 1.

-The target must make a Charisma saving throw or be Frightened of the player.

-Change the type of damage that your spell does.

-Increase or decrease the radius or width and length of an Area of Effect spell by 5 feet.

You may use multiple enhancements in the same spell cast, and each one can be used multiple times in the same spell cast if applicable, but each enhancement used and each time you use the same one adds its own level of Exhaustion.