Overcaster

You are now able to riskily cast spells when you have no spell slots. You may also use this feature if you have less than 1/4 of your current max hp. You exert your spellcasting ability beyond your normal limits. The strenuous process breaks many unused to the intensity of overcasting. 

• When you want to use this feat, you must roll a Spellcasting Ability check with DC 12 + the spell level. 
• If you fail the check you take 1d8 x the Spell level attempted to be cast or you make a DC 25 Con Save. on failure you gain a level of exhaustion