Yesterday Cassandra Clare reveals the new cover for her next Shadowhunter book, The Dark Artifices: Lady Midnight, at New York Comic Con. Today she has given us another gift in the form of a snippet. Enjoy: Ty lifted his face. He’d always had delicate features, more elfin than Helen or Mark’s. His father had said he was a throwback to earlier generations of Blackthorns, and he looked not unlike…