(Disregard the armor on the right arm and lower half of the body in the picture)
In his Demon form, Theloth appears as a handsome man with large, feathery wings and a single, sharp horn sticking out from his forehead. His hair changes from black to white and grows longer. From his fingers up to his elbows the flesh is dark and rough, lightening as it goes up the arms (The same occurs from his toes up to his knees). In his demon form, Theloth has incredibly hard claws that he can extend or retract up to three inches, a prehensile tail that is rather muscular, which he has full control over, along with razor sharp teeth that are capable of easily shredding through flesh. While in this form, Theloth is able to become invisible indefinitely.