Empathy is the ability an Empath has. It is the ability to duplicate the powers of other Casters for a certain period of time. It is unknown how long Empaths retain the powers they duplicated. This power sometimes manifests as a golden light.
Emmaline duplicated Ryan's power to heal Mrs. Lincoln and Macon in Beautiful Creatures. She also duplicated Lena's powers to stop the storm during Macon's funeral and Sarafine's powers which made her cane glow a golden light when she held her cane out to her in Beautiful Darkness. She also channeled Macon's power in the circle to give Ethan the Book of Moons in Beautiful Redemption.