Firkrann was trained by Jedi Master Aqinos without the approval of the Jedi Council. Like many other Iron Knights, Firkrann took a lightsaber crystal name as his own, reflecting both his connection to the Force and his crystalline body. He was destroyed in a duel with General Grievous in the fungi forests of Xagobah.
Joe Corroney was originally going to draw an illustration of Grievous dueling with Firkrann for Unknown Soldier: The Story of General Grievous, but article space and time were against him.