Farmhand, Volume 4: The Seed - Rob Guillory - Bog

"Jedidiah Jenkins was a simple farmer. His cash crop wasn't corn or soy. He grew fast-healing, highly customizable human organs, which he used to heal the world. But it was all a lie. What Jedidiah planned for good, a dark entity has used to transform humanity into something monstrous. Only Jedidiah's children stand in its way. Not all of them will survive."--Amazon.com.