Born amid the molten metal of the Great Furnace, the slith have more than adapted to the perils of a metal world. The slith incubate in the Great Furnace's heat, emerging on Mirrodin's surface only when the suns have aligned overhead.
A slith's form and function are determined by the color of the sun under which it's born. Instinctively drawn to the light of its "mother-sun," each slith follows that sun's path around Mirrodin.
Goblins fear the slith, believing they are children banished from the womb of the Steel Mother, deep within Kuldotha.