Quote from : City of Glass Book

... We are Nephilim; we fight our own battles." "That's not precisely true, is it?" said a velvety voice. It was Magnus Bane, wearing a long and glittering coat, multiple hoops in his ears, and a roguish expression. Clary had no idea where he'd come from. "You lot have used the help of warlocks on more than one occasion in the past, and paid handsomely for it too." Malachi scowled. "I don't remember the Clave inviting you into the Glass City, Magnus Bane." "They didn't," Magnus said. "Your wards are down." "Really?" the Consul's voice dripped sarcasm. "I hadn't noticed." Magnus looked concerned. "That's terrible. Someone should have told you." He glanced at Luke. "Tell him the wards are down.