Although the release date for The Mortal Instruments: City of Bones is still about a year away, we have a production update to share with you.  Along with a new promotional image, we have a fully updated cast listing for the Harald Zwart-directed adaptation of the best-selling Cassandra Clare novel. The fantasy series follows a teenage girl who discovers that she’s descended from a sect of half-angel warriors who protect the world from demons.  Hit the jump for the most up-to-date casting info and a new promotional image.

The long-gestating adaptation of The Mortal Instruments is finally moving forward, and now two antagonists have been cast.  Based on the first book in Cassandra Clare‘s young adult novel series, The Mortal Instruments: City of Bones, the film centers on a young woman who discovers she is the descendant of a line of secret cadre of half-angel warriors locked in an ancient battle to protect the world from demons.”  Lily Collins and Jaime Campbell Bower are set as the leads, and Variety now reports that Kevin Durand (X-Men Origins: Wolverine) and Robert Maillet (Sherlock Holmes) have been cast as Pangborn and Blackwell, two henchman of the film’s main villain, Valentine.

The film adapatation had been in limbo when was without financing, but Screen Gems and Constantin Film recently teamed up to back the pic.  Harold Zwart (The Karate Kid) will direct, with The Mortal Instruments set for release on August 23rd, 2013.  Hit the jump to read the official synopsis.