From publisher blurb:
Dive deep into fears and imagination as you battle new unique ethereal monsters and venture into the haunted Erybos Woods. Leave reality for the Dreamsend and hunt down nightmares in the realm of thought. Add new terror to your next game!
You'll find the following within this compendium's 29 pages:
Dreamsend settings: new places to explore, from the night-mare infested Erybos Woods to the Lake from whence they cross. Enter the Dreamsend itself: a dark, colorless, realm of thought adjacent to the Glimmerreach.
House of Somnas encounter: an ever-shifting nightmare house for players to explore
1 Rogue subclass option: the living embodiment of fear itself: the Nightmare archetype.
21 items: from Psychosis, the mind-slashing scythe, to the Shadowcast Candle that creates a shade you can control.
8 nightmare monsters: not nightmarish, but living nightmares themselves! Face them in the mind or when they cross into reality, from the creeping Edgestalker to the painful Eyestitch.