Fhosforent

Fhosforent is a pink crystal that dragons can mine in Erth's volcanic rock. It can improve a dragon's strength and how long they breathe fire. It is also the blood of Twyll (Graven), Godith's banished son, the black dragon. Consuming it in large amounts facilitates the transformation into the dark dragon form, also known as a Goyle, or to the Hom, a Darkeye.

It was noted ((I forgot by who)) that the fhosforent appeared to be splashed onto the mountain from above.