Prerequisite: Being able to cast spells of 1st level or higher.
Choose intelligence, wisdom or charisma. You gain +1 in the choosen statistic and proficiency in the statistic saving throw. If you are already proficient in the chosen ability saving throw, choose another saving throw between intelligence, wisdom and charisma to be proficient with. In addition, you can use the chosen statistic as your spellcaster ability instead of the regular spell casting ability of your class.