Supply Pact: Reduce Upkeep cost by a percentage.
They should make this happen regargless. It should work like the Vasari ship slot increase research.
Tactical Pact: Turrets gain range, Hangars build fighters for less antimatter and faster, etc. Blanket buff to Tactical structures except superweapons. Or simpler, reduce cost of tactical slot upgrades.
Good. Might also add sharing of buffs like synergy, nanites for disabling regen, or Gauss weapon addons...
Culture Pact: Allow empire's culture to give allies the bonus. Example: You get this pact with a Vas player, and their TEC ally moves some ships into their territory. Now those TEC ships get the Vas culture damage bonus. (If researched.)
Yes! this is really good.
Phase Pact: Shares phase stabilizer network(s).
Another good one... Or shares phase stabilizers allowing allies to build their own network while the pact is active. I've done the latter, it's fun.
Diplomatic Victory: Form Peace Treaties with all players in the game. (Game can continue for others, allowing second-place, etc. Can no longer break Peace Treaty with the winner.)
Cultural Victory: Spread Culture over X% territory.
Economic Victory: Gain X% resources over next highest player and maintain for Y time.
Research: Research Tier 8 Military, (and Defense,?) Civil, (and Diplomatic?) techs and maintain for Y time. (Techs disabled upon losing eighth lab.)
Military Victory: Duh.
None of these sound good to me because they all fail against AI's and against humans aren't very appealing to me.
I've wondered/brainstormed about other conditions. They maybe pie in the sky but sounded fun when brainstorming.
Protect your homeworld - Disables the establish new home world button and you are automatically surrendered if your home planet is lost. Good for PvP or against AI.
Capture the planet/King of the Hill - Fun for massive battles in PvP where fleets all converge on one main planet where controlling the planet for x minutes wins th game.
Capture the system - A PvP map where controlling x% of a distant star's planets and resources wins the game.
Capture the flag - A PvP game where a neutral derelict ship is somewhere in the map and your job is to find it, capture it and take it back to your home planet. If during your care the ship is damaged too much it is made neutral and can be captured by oppossing armies.
Capture the flags - A PvP game where muliple neutral derelict ships are scattered in the galaxy and the player that can locate and return the most ships to their home planet wins.