Crusade

Crusade is a 3-book series with 3 primary works first released in 2008 with contributions by Holly Black, Kelley Armstrong, Karen Mahoney, Rachel Caine, Cecil Castellucci, Sarah Rees Brennan, Cassandra Clare, Debbie Viguié, Dina James, Nancy Holder, Libba Bray, Maria V. Snyder, Melissa de la Cruz, Lilith Saintcrow, and J. Michael Straczynski.