It has taken many long years and countless sacrifices, but finally Ahriman, former Chief Librarian of the Thousand Sons, now exile and sorcerer, is ready to attempt the most audacious and daring feat of his long life. His quest for knowledge and power has all been for one purpose, and he would now see that purpose fulfilled. His goal? Nothing less than undoing his greatest failure and reversing the Rubric that damned his Legion ...