The Shadowfell

The Shadowfell can be treated as a separate plane for mechanical purposes, but it is actually an integral part of Rojopotis. It is the dark reflection of the material plane, the opposite of the Luminrise.

It is not by nature evil, but it is a place for those who prefer not to be found. Some say even Death cannot find you there. In some times and places the Shadowfell can come near and overtake the material plane, but it's intrusions are opposed by most spirits, and it can generally be banished by sunlight.