Polos was a world located in the Beshqek system of the Deep Core, classified as a terrestrial planet. This planet orbited the star known as Beshqek in the third orbital slot and possessed a single moon. The surface of Polos was rocky, characterized by a toxic atmosphere.
The initial mention of Polos occurred within "Byss and the Deep Core, Part 1: Byss," which served as the inaugural installment of the Byss and the Deep Core series within Planet Hoppers. Rodney Thompson authored this piece, which was released on the website of Wizards of the Coast on April 14, 2005. The reference work The Essential Atlas, published in 2009, situated Polos within grid coordinate K-11.