Apate is a deity who is the personification of deceit. She is the daughter of Nyx and Erebos who are both primordial deities. She appears in the myth that mentions about the birth of Dionysus. His Zeus and Semele had a secret affair so Hera would never find out. But the queen of the gods found out and sought help from Apate she willingly agreed to help Hera. She gave Hera a magical girdle which forced Semele into asking to see Zeus in his true form.
Semele died after seeing the god of thunder's true form. The deities could never appear to mortals in their ture form. If they did show their real form no mortal could survive from looking directly at a god.