“She can't hurt him, Izzy," (Alec) "I know you're worried, but he's got the Mark of Cain; he's untouchable. Even a Greater Demon can't harm him. No one can." (Alec) Isabelle scowled at her brother. "So what do you think she wants him for, then? So she'll have someone to pick up her dry cleaning during the day? Really, Alec--” HumourAlec LightwoodIsabelle LightwoodRuneMark Of Cain Book:City of Fallen Angels Source: City of Fallen Angels