Draco : Cambiodraconis melancholicus
A cambial dragon species, also termed a melancholic dragon, or, less descriptively, a bile dragon (this term being just as appropriately applied to the Yellow Bilewyrm.) They “breathe” (more accurately, vomit) bile on their enemies and have a naturally occuring aura of lesser magical darkness imbued in their skins. (Lesser magical darkness blocks divinition magic, but it should be noted that ordinary, nonmagical light will penetrate it just fine. Also, magical darkness is itself detectable as an anomaly. These characteristics distinguish it from greater forms of magical darkness.)