Well, it would be the channelers, not kings or normal men/fallen. So I imagine that it would be something like this
http://www.youtube.com/watch?v=IdqXKa-DCpA&feature=related
It wouldn't be the kingdoms themselves, but the rulers meeting in some magic-commune.
This is EXACTLY how I imagine it would be.
We have the 4 player factions, Red, blue, yellow, and green. Red is obviously the leader of some fallen (or men soon to be fallen). He disappears from the meeting room in a flash of his red crown leaving to wonder if they are all actually there or if they are just spirit projections from their home wizard towers. (obviously the War of Magic channelers would make different exists, but the principle is the same.) I mean, they are the rulers of the world(s) and they would have to be stupid not to communicate with the others to ensure that mistakes of the past that destroyed the world(s) in the first place are not repeated.
In this scenario, it was decided that everybody would work together to build a world-project "magical paradise" to inspire the human race for their technology. Red isn't happy and is going to ensure that he gets his way anyway. He is going to inspire technology, just as the other 3 wizards voted they should, however he is going to inspire the technology that will eventually destroy them. So he can then rule the world once they are gone. In game terms I'd imagine this was a general upkeep of 3 mana a turn or something like that for all players, and a paradise would appear somewhere on the map. The controller of said paradise would get insane influence points, or you could use it to convert mana into influence or something like that..