Corax wallows in despair. He takes the few remaining Raven Guard alive and returns to Deliverance to await his fate. Locked in his fortress-monastery and expecting the certain death that Chaos will soon bring to the galaxy, he begins experimentation on once lost or forbidden science. Manipulating the gene-seed of his legion, he begins to breed monsters. Corax discovers ways to create warriors who can excel at a task with such a singular focus that they are incapable of anything else. Some have metabolisms that are slow to the point of non-existence, who have such keen vision and steady hands that they can hide in plain sight for weeks without food or water, and still be able to kill with a single shot of a sniper rifle kilometers away. He discovers a way to force the so called "pariah-gene" upon a receptive few, eliminating their presence from the warp. With a handful of these marines, no psyker in the galaxy would be safe. And, he discovers a long-lost method, no, more an atrocity, to fuel the metabolisms of certain individuals to levels that would ensure death in minutes. But in those few minutes, these individuals would have the strength, speed, and reflexes exceeding that of even the primarchs themselves, the only side effect being complete insanity. These marines are both an atrocity to and a monstrosity of mankind. Corax cares not. Will renewed, the Raven Guard will fight on, be they monsters or not. He is not done. He is heard muttering the words, "nevermore..."