Design UML diagram for a command line game

The below link relates to an overview blog by Fred Williamson’s explaining what MUD games are and how they are played by a user.
https://medium.com/@williamson.f93/multi-user-dungeons-muds-what-arethey-and-how-to-play-af3ec0f29f4a
• Please note: you are expected to research, design and create your own
game, not just use Fred’s example1