Remember back to your childhood when your parents told you that monsters don't exist? That was just because they were fortunate enough to never have met one. The truth of the matter is that monsters very much do exist,  and they're pissed. In the beginning of the world as we know it, Humans were the favored creation while Monsters were given the short end of the stick. The fleshy pink-skins got the surface. Sunlight, green plants, blue skies, and the like.  And what do they do with it?  They pollute it, rip it apart, and generally abuse and neglect it.  The Creatures, however, were given darkness: the core of the planet, where they reside in secret, biding their time and building up an army to take over the surface.

The day of Metanoia is drawing near.  As one of the lower-ranking Monsters, your job is to scout the human world and prepare for it's destruction.  Infiltration, subterfuge, and sabotage are your objectives.  Fear, stench, and bile are your tools.  Now go forth and wreak havoc.