Cerebrular

While many humanoids tend to be either more left brained or right brained, some have the talent of switching between the two halves in order to accomplish their tasks more efficiently. Those who are Cerebular, however, have the ability to use both halves of their mind simultaneously at their fully potency. Sometimes referred to as being Ambiminded, these individuals have perfectly synergized their logical and creative sides. This unique skill offers a few advantages.

• Your Intelligence, Wisdom, or Charisma score increases by 1.
• You have advantage on all Constitution saving throws to hold concentration.
• You now have the ability to hold concentration on two spells simultaneously.
• Any class, subclass, or species feature that does not allow you to hold concentration on a spell while using said feature no longer applies to concentration spells in the schools of divination, illusion, or transmutation. (i.e. a barbarian can concentrate on the spell haste while raging)