Supreme Focus (Charisma)

Your ability to concentrate on your magic grows, and you gain the ability to maintain concentration on two spells at once. Whenever you take damage while concentrating on two spells at once, you must make separate Constitution checks for each spell to maintain concentration. If you are concentrating on two spells, the DC equals 15 or half the damage you took, whichever is higher. You also gain a bonus to your Constitution saving throws equal to half your proficiency bonus.