Red dragon in Arx Fatalis (Arx Fatalis)

This is already a question from a series of legends :)
Either someone told me, or I read somewhere that there are two dragons in Arx - ice and fire. Everything is clear with the ice one - a cool creature, I even saved his life by depriving myself of the powder from the bones of the dragon :) But then I heard that there is also a fiery dragon. I could not find it, although I searched the lower level of the dungeon in the most detailed way (after all, according to the logic of things, the lava is there, which means that the dragon must be looked for there). So, does he still exist or not?