Baldurs Gate 3 :) FREE US

Ive had some questions about my favorite brain boi US! You have to find him at the beginning of the game (Link Here: https://youtube.com/shorts/WXdxWqnJSEw?feature=share ) then rescue him in Moonrise towers. This part is after Ketherics first phase so heres how I got him as a pet/summon.
(Im not sure if you can get him if youve already missed him.)