Hi! There's a book that can help here, look for a bookshelf with medical info.
Viewing post in Stuck at Making Nik Breathe Properly
Thanks! But now, I'm stuck in the stable house inside Nik's mind to save him. I've already given Nik the Carved Dragon and talked to him, plus got the scene between them. I've gone back to the start of the map, looking for items I've missed but none. Tried talking, using, and looking at Nik but still no interaction. Please help. Thanks again!