Shadowfell

Directly surrounding our material world are two other worlds that mirror ours. One is the Feywild and it is lush and bright. The other is the Shadowfell and it is dark and scary. To travel from our material world to either the Feywild or Shadowfell you need to use magic or find an existing opening between the worlds - there are a few openings, but they are generally kept secret by those who know of them.   The Shadowfell is also known as the Plane of Shadow or Shadowland, the Demiplane of Shadow, the Shadow Deep, or simply Shadow. It is a reflection, or "echo", of our material plane. Except that the Shadowfell tends to be bleak and desolate full of decay and even death. But if there is a forest in an area in our world, then the counterpart of that forest in Shadow would be a slghtly different forest - darker and scarrier than the one on a material world - like a dark relection.   Within Shadowfell are pockets of shadow realms that are unique to each other. These have been "carved out of shadow" by a powerfull being that resides there. While that being resides on the shadowplane, this pocket shadow plane will exist. if that being is killed or leaves the pocket shadowplane - then the pocketshadow plane will dissolve back into Shadowfell over time thus losing its individuality and uniqness. In some cases, as in the case of weak or new pocket shadowplanes, this is a realtively quick change. While with pocket shadowplanes that have existing for a long time and/or are strong, this process would take time - perhaps decades.   There is also the Shadowdark, which is the reflection of the Underdark in the Plance of Shadow. The Shadowdark is far colder than the rest of the Shadowfell and massive ice sheets make up much of its interiors.   A unique species that originates within Shadowfell is Shades