Dungeons & Dragons is starting to ramp up its marketing campaign for its next adventure book, and that means we’re starting to get a deeper look at what lurks within the strange Netherdeep. Next month, Wizards of the Coast will publish Critical Role: Call of the Netherdeep, a new full-length D&D adventure book set in the Critical Role world of Exandria. Not only is this the first full-length adventure published for the Exandria campaign setting, it also promises to reveal more hints and teases about the various mysteries of that world. That includes more details about the Netherdeep, a strange underwater realm of gloom and corruption that’s at the heart of the new book.

When entering the Netherdeep, be alert in dark waters. A Slithering Bloodfin lurks where the light cannot reach. Keep close to the surface if you value your life… pic.twitter.com/BcQhTs9Wbj

Take a dive into the new dynamic character building for Rival NPCs in Call of the Netherdeep. Watch as both the leader Ayo Jabe and her party change and adapt to every crucial moment in your campaign. pic.twitter.com/3f1O43memW