There are places where the edges of reality get thin. Beings from other planes are drawn to our plane, and they are the mythological creatures from our past. Then there are the others. Our subconscious fears draw other creatures to those thinning spots, dark things that want to feed. On us.
There are heroes who walk our world, trying to hold back the darkness. Some work for government agencies, while others freelance with those who have likewise been awakened to the Hidden Worlds. The governments have a vested interest in keeping these reality incursions hidden from the public. People would panic. Governments would topple. Lives would be lost.
Now that you have been awakened, how will you fight the creatures in the World of Incursion?