Increase your Intelligence, Wisdom, or Charisma score by 1, up to a maximum of 20. 

You are able to form a lasting connection between your mind and the minds of others. As a bonus action, you can choose a number of creatures up to your charisma modifier (minimum of one) that you can see OR choose a single creature that you are familiar with and know the approximate location of is (must be within 1 mile of you). You and the chosen creature(s) can speak telepathically with each other while you are within 1 mile of each other. To be understood, you and the chosen creatures must speak mentally in a language the other knows. 

The connection lasts for a number of minutes equal to your character level. The connection ends if you or the creature becomes incapacitated or die or if you form a new connection with a different creature.