The Mortal Instruments
Basically, Clary Fray and her friends are trying to stop a war that her father, Valentine Morgenstern, started and her brother, Jonathan Christopher Morgenstern, is trying to finish. The rpg starts where the last book, City of Lost Souls, ended... With Jonathan Morgenstern on the run with the newest Mortal Cup that creates a new race of Shadowhunters with demon blood instead of angel blood. Will Clary, Jace, Isabelle, Simon, Alec, Magnus, Jocelyn, Luke, Maia and Jordan be able to stop Sebastian before he creates an entire army of demon Shadowhunters?