Mental Focus

General Feat (Prerequisite: Level 4+, Spellcasting or Pact Magic Feature)

Your study and experience with magic has allowed you to be able to split your focus and multi-task. You gain the following benefits.

Ability Score Increase. Increase your intelligence, Wisdom or Charisma score by 1, to a maximum of 20.

Mental Concentration.  You can maintain concentration on two spells simultaneously. The mental effort of maintaining two spells drains your ability. Once you maintain concentration on two spells, you can't do so again until a short or long rest. In addition, you have advantage on Constitution saving throws to maintain concentration on a spell.