Jace knelt down beside Clary and took out the stele. He looked up at Izzy, questioning. They had practiced, and practiced, but they had never had to put this to practical use. "Okay, the dreams say she has to be one of us or it would kill a regular person, but we know she is. I used it in one of the dreams." He was reassuring himself before he put the instrument to her skin.
He took a deep breath. "Okay," he said, looking down at Clary. "I'm here, and I'm going to try a healing rune." He wasn't sure if she understood what was going on, but his voice was soothing. He moved her a little bit, pulling her jacked open enough to eventually reveal a shoulder. Slowly, he began to draw the healing rune.