Dragon of Tyr
Considered one of the most dominent beings in Athas, even the Sorcerer-Kings are scared of this force of nature.
Every year, just after the Festival of the Cooling Sun, the Dragon flies in from across the Silt Sea to collect tributes of people from all the major cities, whisking them back to his lair to presumably devour them.
Asides from this, nobody remebers the Dragon ever meddling in Athasian politics, or even taking an active interest in any of the goings on in the Tyr Region. Although, very rare (which often means prohibited) scriptures have been found alluding to the Dragon collaborating with the other Sorcerer-Kings in certain matters such as the downfall of Dregoth, or the destruction of the lost city of Ebe.