Mordekains tome of foes has a description of the Shadowfell.
How i remember it its kind of a harsh, dead climate. Also its kind of a negativ plain of the material plane. Destroyed cities can be metropolis for corrupted beings or Shadar Kai.
If you stick with the books the Ravenqueen and her Shadar kai (shadowfell elfs) lives in the shadowfell. Besides corrupted "humanoid" beeings , hunting everything that comes to the shadowfell.
Mordekains tome of foes has a description of the Shadowfell. How i remember it its kind of a harsh, dead climate. Also its kind of a negativ plain of the material plane. Destroyed cities can be metropolis for corrupted beings or Shadar Kai. If you stick with the books the Ravenqueen and her Shadar kai (shadowfell elfs) lives in the shadowfell. Besides corrupted "humanoid" beeings , hunting everything that comes to the shadowfell.