Azathoth is the most powerful god-like being in the Cthulhu Mythos. He is sometimes called the "Daemon Sultan". He sits and dreams in a court at the center of infinity, attended by monstrous servitors whose fluting lulls him, as well as by lesser gods. He is described as a "nuclear chaos", a "blind idiot god" who created the universe without knowledge or caring.
Nyarlathotep is the primary servant of Azathoth, and perhaps even a manifestation of Azathoth. He often uses his great intelligence to manipulate the mindless god.