Saying that Yog-sothoth is stronger than Azathoth and that existence is a dream of Azathoth are common errors, but the reality is that Yog-sothoth is weaker than Azathoth since the only thing he surpasses him in is intelligence since he is omniscient. . Also saying that existence is a dream of Azathoth is just an erroneous fan theory since Lovecraft himself said that ''If Azathoth wakes up from his dream he would destroy all existence'' but he never said it was a dream, it would be more than If he awakens he will destroy all existence. (Sorry if I have many spelling mistakes or it is not understood well, it is just that I am using Google Translate)