Ci:pherel - A natural dragon who can "read" a person's auma and thereby detect whether they are telling the truth, or are who they claim to be.
Quoted straight from the Rain and Fire Guide Book.
The New Arctic Wearle has at least one Ci:pherel, who is present when David talks to G'Oreal in Dark Fire. It is described as '...a magnificent purple beast, slimmer of face (than G'Oreal), with dramatic green eyes and a prominent carina. A patten of semi-radiant fins, as precise and threatening as the thorns on rose stems, followed the outlines of its skull, growing larger in size as they ran to its neck.', but not named.