Dungeons & Dragons 5e Element 133 Class Feature: Cognitive Link

You have begun increasing the mental capacity of your Thrall. For every 4 digits higher then 10 in your Host's Intelligence, Charisma, and Wisdom scores you may increase one of your Thrall's Intelligence, Charisma, or Wisdom ability scores. For example, if your Host's scores look like this; INT 16, WIS 12, and CHA 18, You have 16 digits above 10, divided by 4. Means you can increase your Thrall's Intelligence, Wisdom and Charisma scores for a total of 4 digits.