And he opened the bottomless pit, and out of the pit there went up a smoke like the smoke of a great furnace. And the sun and the air grew dark, because of the smoke out of the pit.

and thus I saw the horses in the vision and their riders. They had breastplates of fire, "red as fire, dark blue as jacinth, and yellow as sulphur." The heads of the horses were like lions' heads, and out of their mouths issued fire and smoke and brimstone.