The Shannara Chronicles (2016)

S1E4 Changeling

Amberle takes on a perilous mission to demonstrate her value to the Ellcrys, while the Dagda Mor unleashes the Changeling, a formidable, shape-shifting demon, to eliminate her and anyone that stands in its path. However, with the ability to assume the appearance of anyone within the palace, locating the demon proves to be a daunting challenge.