Divided Mind

This feat is created by Nedrapter for use in his Land of Arda campaigns, and are balanced to the hardcore nature of them. 

• Increases your Constitution score by 1, to a maximum of 20.
• For a number of turns equal to your Proficiency Bonus, you can concentrate on two spells instead of one. After the duration, the one that was first cast, expires.
• While concentrating on two spells, the DC for saving throws to maintain concentration is 10 + the sum of spell slot levels used in the two spells, or half the damage taken, whichever is higher.