Shadow

Shadow is an ink-like material created when Wilfre drew in the Book of Life. It can appear in many forms, such as a viscous, gooey liquid or a thick fog.

Living things
Shadow goo spontaneously forms monsters, most commonly shadow walkers. Shadow also mutates animal and plant life it comes in contact with. Shadow has an effect on raposa such as Wilfre and Jacob.

Shadow goo acts as something like a parasite or disease on raposa and other living things.

In plants and fungus, it may make certain species giant, while killing other species. This is generally determined by how destructive the plant is, since it fits the nature of shadow goo. For example, giant inky cap mushrooms are in while banya, the staple food of the raposa, is out.

Shadow may also infect animals. The telltale sign is shadow around the eyes of the animal, though shadow may also appear on other body parts. It causes the animal's meat to be infected with shadow, and may also cause increased strength and aggression.