You can use the 5th Edition Dungeons and Dragons system.
You cannot publish content in previous rules systems (OD&D, Basic, AD&D, 2nd Ed, 3rd Ed, 3.5, 4th Ed).
You can create setting generic content. You can also create content for Forgotten Realms (Faerun), Ravenloft, and Eberron.
You cannot create content for Greyhawk, Dark Sun, Dragon Lance, Zendikar, personal settings, or any other D&D setting that is not specifically listed above.
RPG supplements and stock art resources only at this time. Short opening fiction to illustrate your RPG setting is allowed, but only if included in the setting material (not sold separately). Files suitable for use with Fantasy Grounds virtual table top software are allowed.
No artwork may be used from any Dungeons and Dragons publications, except those specifically made available here on DMsGuild.com. You may use artwork from the DMs Guild’s Stock Art selection and public domain artwork. You must have permission to use any artwork. Please read the FAQ further for more information on the use of art and logos in your content.
Logos and Trade Dress
The DMs Guild logo must appear on the cover of your work. It needs to be legible when viewed at full size. It does not need to and should not be the primary logo or title on your cover. You may not use any other logos or trade dress from Dungeons and Dragons publications.
No personal branding images can appear on the cover of your work but are allowed inside your title.
You are encouraged, but not required to use the Dungeons and Dragons Template when creating your work.
You can find the template here.
The following text (must be placed within the Work, wherever the Work otherwise lists legal and copyright information):
DUNGEONS & DRAGONS, D&D, Wizards of the Coast, Forgotten Realms, the dragon ampersand, Player’s Handbook, Monster Manual, Dungeon Master’s Guide, D&D Adventurers League, all other Wizards of the Coast product names, and their respective logos are trademarks of Wizards of the Coast in the USA and other countries. All characters and their distinctive likenesses are property of Wizards of the Coast. This material is protected under the copyright laws of the United States of America. Any reproduction or unauthorized use of the material or artwork contained herein is prohibited without the express written permission of Wizards of the Coast.
©2016 Wizards of the Coast LLC, PO Box 707, Renton, WA 98057-0707, USA. Manufactured by Hasbro SA, Rue Emile-Boéchat 31, 2800 Delémont, CH. Represented by Hasbro Europe, 4 The Square, Stockley Park, Uxbridge, Middlesex, UB11 1ET, UK.
Neither your Work nor any promotional material, including blog posts or press releases, may contain racist, homophobic, discriminatory, or other repugnant views; overt political agendas or views; depictions or descriptions of criminal violence against children; rape or other acts of criminal perversion; or other obscene material without the express written permission of Wizards of the Coast in a document separate from this License.
Illegal and Infringing content is not allowed. It is the content creator’s responsibility to ensure that their content does not violate laws, or copyright, trademark, privacy, or other rights.
Create, don’t copy. We reserve the right to stop publishing and selling your work if we think it goes against the spirit of the Dungeon Masters Guild program. All authors should respectfully use the content originally created by Wizards of the Coast or other Dungeon Masters Guild creators. For example, if a Dungeon Masters Guild author releases a trilogy of adventures, and another author takes those three adventures, compiles them, and republishes them as a single collection, without substantive original additions or changes, then we would stop publishing and selling that collected work because it adds no value to the Dungeon Masters Guild community content. It’s simply one author copying another author’s work and looking to make a royalty on it.