...the following would ensue.
(I know that it's technically multiplayer, which we're not supposed to even think about, but whatever!)
The game(mode), temporarily named "Siege", combines elements of both Fortress and Adventurer modes - it throws 12 (?) adventurers (heroes/champions/pros/whatever) in two teams to defend...
Planepacked and Broiledprinces, respectively.
YES, you heard right - the two great mega-artifacts, with stories of the world(s) engraved on them.
But wait, you start with basically nothing! What to do?
Well, if Fortress mode skills make it into Adventure mode (which is my sole demand right now, btw), then YOU are the ones who build the base around your mega-artifact from resources nearby, YOU craft your weapons, YOU defend your base.
I do realize that there would be many issues with such a gamemode, like friendly fire, disadvantages because of lack of resources and the like - we could either have preset, symmetrical maps for Siege or randomly generate worlds for it. The bases could even be located in the very ends of the (huge) world for sake of long-term play.
Think about it...Relatively loose objective to fulfill, but at least there's one, unlike in Fortress and Adventure modes (not saying it's bad thing to not have an objective).
Now, we could have just our standard dorfs and the like as possible adventurers, but given how many creatures Toady has put Armok has spawned...There's quite a lot of variety possible - necromancers, goblins, antmen, flying kobolds, fire-breathing vampires - and just wait until we have proper magic for even MORE FUN!
And don't forget - carps are still lethal vs dwarves.