Split Concentration

You have trained your mind for a long time, and you are now able to concentrate on multiple things in the heat of battle.  You gain the following;

• You can concentrate on two spells at the same time.
• While concentrating on two spells, you must roll a concentration check at the beginning of each of your turns, the DC being 8 + the total level of both spells being concentrated on.  If you are concentrating on a spell cast at a higher level, you must use the spell slot the spell was cast at as the spell's level for this save.  (i.e. if you cast thunderous smite at the 4th level, the spells level is now level 4 for the purpose of this feat.)
• Add +1 to your constitution, to a maximum of 20.