Mythra is the Aegis, a Legendary Blade who can grant tremendous power to her Driver Rex, and his allies. Since Pyra is another personality Mythra created, before her and Pyra had separate bodies, they freely switch places. Rex is able to freely use this ability both in and out of battle upon starting Chapter 5. Mythra's powers have a focus on light-element attacks. Some of her other powers include near light-speed movement and Foresight, which allows her to see into the immediate future.