The Ashura Norns are a genetic breed created by Lone--Wanderer which are especially useful for DS players. They come in two forms, one using chichi sprites and the other, magma sprites - the two official Norn breeds available from Gameware for Docking Station. The Lone--Wanderer says: "I only did that so people could have a choice of what they wanted them to look like."
Their biochemistry is quite unique. The gengineering of the Ashura Norns includes great longevity and reduced sex drive, and they can eat detritus and are unharmed by trapper plants and beasts. They never develop "handophobia" from receiving punishment, among other modifications.
The Ashura Norns are available at KnyteTrypper's C3/DS Nexus.
See also the Asura Ettin.