Wow, I spent many hours on those Battletech Muds. It did have a cool realtime battle system but the faction vs faction wars never happened as far as I remember. There were several offshoots, including some that did 24/7 "live" battles that focused on one planet which was much more scalable. Organizing a scouting expedition was pretty fun. There was a Solaris world too. I ran the Kurita mechwarrior school for a while, doing new pilot training, and I was one of the people who could log in to the TK faction leader account. But then I graduated and got a job haha.