A unique Diplomacy Victory where every surviving empire is in alliance.

Get my vote.

Like your addition: the empira that contributes the most is the "winner" or akin. This makes an interesting combe, where none is defeated, but the one that has been more time in alliances, proposed it first or could made more diplomatic agreements is recognized as "winner" by other players

I like this one; I was thinking this earlier when I was reflecting on the new mechanics of alliance and the improved scope for team play and allied victory (as compared to Endless Legend). I think there needs to be more to it than simply gathering everyone into alliance, however, otherwise it'd be fairly easy to cheese with the AI and be uncompetitive in multiplayer.. Perhaps all empires need to be in research/trade agreements too, or the galaxy needs to have avoided any kind of conflict for a given number of turns. Players need to consider their ability to win victory conditions independently during this time, which would put the alliance to the test.

Yeah, there definitely needs to be enough moving parts that one would have to actively work for this and I definitely agree that it should be time-consuming enough that other victory conditions coming up should be a sore temptation for any individual member.

I'm even okay with this being a rare or not-terribly-viable victory condition (especially competitively), but more something that makes for interesting emergent storytelling. 

This is such a good idea. It's actually very unique and get's the player to think different when apporaching the game, which is what different victory types should challenge players to do. I love it.

Is it not already domination victory? You can achieve economic victory as an alliance, so why not others?

I was thinking about this gameplay style the other day too.  Think of it almost as a Cold War victory. No one can attack anyone, else mutually assured destruction occurs. Or think of it as the Utopia where all political gameplay and deception must lie below the surface and remain undetectable, or at the very least unproveable.

This would be a fun alternate to add in.

NovaBlazer wrote:

I was thinking about this gameplay style the other day too.  Think of it almost as a Cold War victory. No one can attack anyone, else mutually assured destruction occurs. Or think of it as the Utopia where all political gameplay and deception must lie below the surface and remain undetectable, or at the very least unproveable.

This would be a fun alternate to add in.

Bingo, you got where I'm going with this line of thought. This sort of "Game of Thones"-y stuff needs to happen emergently in 4X more often I think.  :D

With a potential Happy End for those who genuinely have plans to make the galaxy a big cuddle party.