The Last Key — James Wymore

The Actuator, a machine capable of literally changing reality, was created to make a utopian paradise. Before it happened, a saboteur used it to transform the world into patches of every kind of genre fiction, scattering the keys necessary to put it back across the globe. Everyone alive found their lives radically altered, some living in fantasy realms with real magic and others in incomprehensible horrors. Thrown into chaos, people struggled against aliens, pirates, orcs, and vampires. Many died. Only a handful of people on the planet, called Machine Monks, even knew why it happened or how. Now they have to put it all back before humanity is destroyed. Continuing their quest for the Actuator keys, the Machine Monks realize their cause is becoming hopeless. An army of half-machine men is rapidly spreading over the face of the earth, converting anybody they don't kill to their cause. With superior numbers and technology, their leader will not stop until every living human is subdued and loyal to him. Keeping the first key with him, preventing anybody from using the Actuator to change the world, the sociopath rampages. Even if they could get all the keys, the small group opposing the tyrant don't know what to do when they get to the final one -- a key they've never seen before. If they don't find the answers fast, the world will be lost.