Of Two Minds and Overcast, two feats for spell casters

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### Of Two Minds
*Prerequisite:  The ability to cast at least one spell*
___
Through study and force of will you have learned to concentrate on two powerful spells at a time, but everything has a cost.

* You can maintain concentration on two spells at a time.
* One of the spells you are maintaining concentration on, your choice, ends automatically after a number of rounds equal to your spell casting ability modifier (minimum 1).
* At the end of those rounds (or sooner if you decided to end a spell prematurely) you must make a Constitution saving throw of 10 + the ending spells level or gain a level of exhaustion. (Cantrips have a spell level of 0)
* If you are forced to make a constitution save to maintain concentration, you make a save for each spell. If you fail either save, you gain level of exhaustion.

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### Overcast
*Prerequisite:  The ability to cast at least one spell*
___
Through study and force of will you have learned to heighten a spells effectiveness, but everything has a cost.

* If you're casting a spell that has an increased effect based on what level spell slot is used to cast it you may choose to Overcast it.
* When a spell is Overcast it is cast as if it is using a 9th level spell slot but only cost the lowest level spell slot required to cast that spell.
* If the spell uses dice to determine damage or effectiveness (i.e. Sleep) the dice increase by one step.
* Once you use this ability roll 1d6; on a roll of 3 or below take that many levels of exhaustion, one a roll of 4 or higher you die instantly and make no death saves. 
* You cant use this ability again until you are no longer under the effects of exhaustion and you finish a long rest.