What about a different 'server list' mode
The land at map view would be the server list hosted at taleworlds.
Each party would represent a player, that in the beggining would have just one unit, the player.
When two players meet they can battle.
The player that is first attacked will be the host.
Or the 2 can decide upon joining.
Or a check for faster machine and largest bandwidth could do this trick.
Or even the player that accepts more players to join the server would be the host.
If you pass mouse over one player at map mode, info like ping, players limit and password protected will show up.
Battle acceptance could be required from who is being attacked also, optional, a bit like password protection.
This would be lightweight to taleworlds host.
And based on this, there could have a MORPG begin, I mean just few things like you could have small quests with several steps updated dinamically by taleworlds.
So you could follow these quests and while doing it you could also battle with other players to have action fun

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You could also fight on the quests related battles locally offline, or in cooperative mode with other players

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Players could hide stuff at map for treasure hunt following tracks etc.
