The Polydroxols were a race of shape-shifting creatures resembling a 200 kilogram mass of mercury, in its liquid state. They were capable of changing into amost any shape, but do not have the ability to mimic colors. They were native to the toxic world of Sevetta, where they lived in volcanic pools of molten metal. They had a complex circulatory system which passed electrglobins throughout their bodies, and lived without oxygen. On their homeworld, Polydroxol always travel in pairs.