"I'll tell you what -- We ride South, find the girl ourselves, ride back to Emerald City with her head and win Wizard's loyalty."
—Dorian to fellow soldiers
He grew tired of following Eammon and decided to kill him - however, it was Eammon who killed him.
Dorian wanted to kill Eammon and make it look as if the lions did the deed. His body was found mangled.