Split Consciousness

You have learned to split your consciousness in two. When you do this, your intelligence increases by 1 and you gain the ability to maintain two concentration spells simultaneously. However, if you are attacked in this state and the attack lands, the attack is automatically a critical, and you're forced to drop one of your concentration spells. You are also are forced to make a wisdom save when leaving this state in combat, with a dc equal to your own spell save dc; on a failed save, you are stunned for 1d4 rounds.