The Paths of the Chimerum
When you step into the Veil you enter a landscape of vague reality that exists between several places. More formally this is called the Umbra. It's most heavily influenced by the Spirit World, but it also touches on dreams and the edges of the Second World. It's a place without a cohesive geography and home to a long list of creatures: spirits and monsters and a few lost travelers. The short of it is, you're lost without a guide.