The C3/DS Fire Norns are made by Tafgana. They are based on the Magma Norns and use Ettin slot F. They can be downloaded at Aqualbia.
The Fire norns have lots of extra stuff, as well as a new genome. They feel at home in warm places like the Ettin Desert, and make their surroundings even hotter. They hate water.
Did you know? They also come with the Fire Agents by Marcus K..
NOTE: Aqualbia is currently down; but you can still download the Fire Norns in the Creatures 3 Breeds section of Alien's Creatures World. You may have problems with the male body data, though, but you can download replacement data from the same page.