Due to this fact, Morocco hires Despara to assassinate Roya. Because Roya's mother had joined bodies with Despara right before her death - as a result of her protecting Roya - Morocco could never look Despara in the face without being thrown into fear as to look at his own wife's face.
Because of this situation, Morocco hires Despara to kill Roya. The fact that Despara's mother had merged with Roya before her death, in an attempt to protect her, makes it impossible for Morocco to look at Despara without feeling a deep sense of fear, as he would be seeing the face of his own wife.