What They Don't Tell You About The Shadowfell - D&D
Basically the Shadowfell
D&Ds Shadowfell: Monster Guide
D&D Lore - The Shadowfell
Darkness in D&D: An Analysis of the Shadowfell
Warriors of the Raven Queen, they are forever tied to the Shadowfell - Shadar-Kai Deep Dive
Exploring the Shadowfell
The Shadowfell (A DM's Guide!) - Experience Gain!
Trapped in the Shadowfell
What the f*ck is The Shadowfell? - Dungeons & Dragons
What They Don't Tell You About The Undead - D&D
Gloomwrought, City of Midnight | D&D Lore
Shadowfell - History and Exploration of the Plane of Shadows
What is the Shadowfell? | Dungeons & Dragons
What They Don't Tell You About Orcus, Demon Lord of Undeath - D&D
What They Don't Tell You About The Inevitables - D&D
What They Don't Tell You About Griffons - D&D
Skulks—when you're so lost in the Shadowfell that you lose yourself (D&D Compendium of Monsters)
Basically the Underdark
D&D Lore: Shadowfell