Atlas' Revolving Star

You cast an arcane shield to protect you and your allies from magical harm. If you are in a space that is affected by and area of effect spell, or you are the target of a spell, you may use your reaction to shrink the area of effect to only the space you are occupying. When the magical energy would hit, you must roll a spell attack roll to redirect the energy back at the caster. (You use your spell attack roll if its a spell or your Spell save DC for the redirection of the spell.) 

When you cast this spell roll a Constitution Saving throw equal to your Spell save DC, if you fail you get one point of exhaustion. If you roll 10 or below you take half the damage of the attack. If you roll a natural 1, you suffer all previous effects and only you take all the spells effects.