The Spirit of Carnán is a a boss and main character in Middle-earth: Shadow of War. She is a guardian of the forest that resides in Mordor. The first time you encounter Carnán, you will need to battle it over multiple stages. Carnán shapeshifts and takes on the form of a Caragor, a Graug, and a Drake during the battle. For each transformation, you need to use arrows to bring it down in each stage of the fight.
When Carnán is flying around as a drake and attacking with fire breath, you need to constantly move around to avoid the flames and attack with your arrows.