W.I.T.C.H. S01E18 Gargoyles Into Guardians

Phobos sent a group of Mogriffs, shape-shifting monsters, into Meridian to pose as and discredit the Guardians so Elyon would lose what little trust she had left in her friends. While the real Guardians battled with their evil twins, Cornelia and Caleb tried to persuade Elyon that Phobos is not as good as she believed, but she would not listen. Caleb, however, did something to shake Elyon's faith in her new brother: he bowed to her. Unnerved by this, Elyon started to suspect that Phobos was not telling her everything. Caleb took the Book of Secrets and sealed inside there were the plans for Elyon.