Some of the illegal things on MUME:
1. Playing more than one character at the same time.
2. Having any of your own characters helping any other of your own characters.
3. Trading, giving or sharing characters or accounts.
4. Having multiple accounts.
5. Hacking into someone else's account.
6. In any way helping someone on the opposite side of the war (e.g. not killing them when having the chance).
7. In any way creating bots within your client to perform tasks while you are not there.