Three players must work together against the undead AI factions. Sedge also causes trouble in the eastern mountains of the continent and there is a wildcard faction of bandits and pirates that attack everybody. Timelimit is 50 turns but bad stuff starts happening well before that (sorry, no spoilers). The map has some other hidden events that may or may not trigger depending on what players do. Losing your commander doesn't eliminate you (like most of my maps) but don't let Mercia die or things will get a lot worse for the good guys.
Map pics @https://imgur.com/gallery/vow9qSZ