Shadow Flux: A Savage setting of Mystery and Horror in the Twenty-First Century is a fan-made setting supplement for Savage Worlds. The introduction provides a brief overview of a dark version of the modern world, where horrific supernatural forces hide themselves from rational apprehension using the power of Shadow. The player's section has new archetypes, edges, and spells. The GM's section has new monsters, including vampires, ghosts, lycanthropes, sidhe, and many demons.