Arcana Overcharge

This spell is a part of The Magistry's Sacred Magic. Sacred Magics have their own specific rules compared to normal spells.

It is important to read The Magistry's Sacred Magic tab.

Using a forbidden magic trick, you cause your internal mana to overcharge, turning your energy rampant. For the duration of the spell, every time you cast a spell is further upcasted by 1d4 level which can exceed 9th level. You can also expend more than one spell slot per turn to cast spells. At the end of your turn, you must make an Arcana ability check with a DC of 10. If you fail, the spell ends abruptly. The DC for this spell increases by 10 each time you succeed on this ability check.

The stress of casting Arcana Overcharge severely weakens your magical prowess. After the spell ends, for the next 4d4 days, you cannot cast leveled spells and automatically fail Intelligence (Arcana) skill checks. For each of those days you spend resting and doing nothing more than light activity, your remaining recovery time decreases by a day. 

At Higher Levels. When you --somehow-- cast this spell using a spell slot of 10th level or higher,  the DC for this spell does not increase.