The Boise Mutant Horde, also known as simply Boise Mutants, are the hideously twisted and deformed monsters that swarm much of inner Boise and some of the lands beyond. Their origin is unknown, though many believe it has to do with some reservoir of mutagen (theorized to be FEV) located at the ruined city center. They are a plague upon Boise, and their numbers grow with each passing week. If they are not eradicated wholesale, or their central pool remains intact, then they may very well overwhelm all inhabitants of the Boise Wasteland.