Shift’s tone when he answered was matter-of-fact. ‘It is a scroll made from the skin of an angel. The skin is tattooed with words, in an ink made of the angel’s own blood. The scroll is a primer of the tongues of angels, otherwise known as the Language of Command. A language that, like the language of the sidhe, has no written form. The primer is in the Roman alphabet, with the phonetics of Latin used to approximate the sounds of the words of the Language of Command.’