This is, of course, assuming that you have permission to use the Unreal engine. For example, you cannot place our Space Marines in a Disney total conversion using the Unreal engine, but you could make a TC solely using Space Marines with the Unreal engine. If you want to make a game, TC or a mod using our IP you must adhere to the following (in addition to the general principles as outlined above):Īny game or mod must be a 'total conversion.' In other words, you must not use our intellectual property (logos, images, names etc.) in relation to the worlds, names, logos, or images of any other company. We are not inherently opposed to hobbyists creating games or mods using our IP, in fact we are flattered that people want to spend so much time creating games and mods in the GW universes. We want people to express their enjoyment of our games with as little interference from us as possible, as long as they behave reasonably with our IP and follow any reasonable requests that we may make. Modifications, Total Conversions, and Games

However, your examples that you sited like a character in demigod would violate their rules as it's not a total conversion. Anyone saying you can't under any circumstances is incorrect.

No wonder there isn't that many WH40K mods out there for games I even thought about putting a space marine in Demigod but since they are so tight A$$ed then I guess I will have to think of something else to do with the game Dude that suck so if I were to make just a few of the ships and release it on the net they would put out a C&D on me or will they just sue me.

Warhammer 40k mods for games