1. You can not make yourself too powerful, eg. Lord Vetinari.
2. You cannot try to tell other users what to do.
3. You must not insult other people.
4. You cannot use a existing Discworld person, you have to make your own.
5. You can start taven fights but no one is to be visted by Death.
6. You can work in the Broken Drum but you not too bar anyone.
7. You can have objects from any of of the books, eg. the Luggage or spell books.

Thanks!