From Protector of the Grey House:
Edwin yelled the three short lines of Latin he knew and watched as two pillars of smoke formed into hideous beasts in front of him. Christopher taught him the lines when he had placed him in charge, and told the younger vampire never to utter the words unless absolutely necessary. The demons the words called forth were unpredictable at best and would only perform one task for their temporary master before running off.
Edwin stared at the horrors that stood before him, pointed to one then to Vincent. “Kill him.” He pointed at the second then at Natalia. “Kill her.”