The Wyld consists of the unstable realm between Creation and Chaos. Creation operates by natural and supernatural rules: animals grow and rocks don’t; water freezes when it’s cold and boils when it’s hot. Chaos operates by no rules at all. Nothing about Chaos is defin- able in any way humans could understand. In the Wyld, these two realities mix. The entities of Creation are defined by their qualities: their size, shape, substance, color and so on. The taint of Chaos breaks apart these qualities and recombines them. In the Wyld, the boulders can be made of flesh and the animals of stone. The rain falls up, or fire is cold. Humans become beasts. Beasts become humans. Grass grows the size of trees, while trees grow the size of grass—for a while, until they all become something else. Nothing is sane. Nothing is safe. Anything brought into the Wyld becomes part of it—quickly or slowly, but inevitably, unless some power- ful force prevents it. In particular, people change. Some people find their bodies changing in strange and often horrible ways. Others remain human in form, but the Wyld warps their spirits into perverse insanities. People who spend too much time in the Wyld suffer both sorts of change and become bizarre, savage monsters.