Last, Best Hope

REQUIRES LEVIATHAN DLC

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Player empire at 40k/50k/60k fleet power (normal, hard, insane) MTTH is halved.



MTTH is multiplied by the number of Fallen Empires



If any Fallen Empire planet has been taken in war by a default empire (can be AI) then MTTH is reduced by 10 years.



Within 5-10 years of an endgame crisis starting, the Xenophile or Materialist Fallen Empires may Awaken as a "Guardian of the Galaxy". ( NOTE: a Fallen Empire awakening in this manner will NOT trigger an "Ancient Rival" event and therefore will not trigger War in Heaven. For this reason, DO NOT turn on endgame crisis to get this achievement)

600+, 3 Fallen Empires, turncrisis, 1 other AI, 500% habitabilityHivemind, Fan militarist/authoritarian + Distinguished admiralty (or what ever works best for you)What an achievement. Before I start, here are the mechanics behind the "Awakening" of Fallen Empires. At least 100 years must have passed and the Fallen Empire must be above 40k fleet power. At that point, the MTTH starts at 50 years, and is reduced by the following events:First, the mechanics. The War in Heaven is a very finnicky event. In order for it to occur, there needs to be two Fallen Empires of opposing ethos, one of those Fallen Empires Awakening (NOT due to end game crisis), declaring the other Fallen Empire an Ancient Rival, then the second Fallen Empire Awakening, then a pop up happens for War in Heaven. The pop up will have 3 options, side with Empire A, side with Empire B, or don't side with either. The War in Heaven has a chance not to occur at all. If one fallen empire awakes and its counterpart does not awaken in the next 10 years, then it will not happen at all. Fallen Empires will awake when another player empire has matched them in Fleet power, a different Fallen Empire has lost planets through war, or in response to end game crisis. War in Heaven will ONLY trigger in the first two situations, not the third.Second, preparation. I chose a large map of 800+ for an extra chance at the enigmatic fortress, which i must say is almost entirely necessary. I set only one other empire to exist so I wouldn't have to worry about anything other than expansion and research. This is important because you do not want to deal with enemies while this is happening OR be forced to increase your fleet power to match the Fallen Empires before you are prepared for the War in Heaven. Okay government: A lot has changed in 1.5 and I might change this section as I explore more and more, but so far I am impressed with hivemind. Especially in a galaxy with one other AI, hiveminds excel when the only concern is expansion. My other choice would be Fanatic Militarist/Authoritarian + distinguished admiralty (and which ever other civic you'd like). You dont necessarily need to start with it, but distinguished admiralty is really quite amazing. Giving you an 8% fire rate boost translates nearly to 4% bump in fleet power. While that may not seem like much, its a bump in fleet power you don't need extra steps to get, like building more ships with extra minerals, energy, or fleet cap civics.Third, the play book. For traditions grab planetary survey corps in discovery RIGHT AWAY. After which you'll need to make a choice depending on your circumstance. If you have really good planets near you with lots of tile blockers, finish discovery and grab mastery of nature. If not, start down another tree, also depending on your circumstance. If you spawned next to the other AI and want to knock him out early, go down supremacy. Otherwise, I would grab expansion up to Colonization Fever, Prosperity up to The Pursuit of Profit, and Harmony up to Paradise dome. On every colony your first priority should be Unity procucing buildings. Basically you want to expand and conquer early game to get ahead. Find and destroy the other empire that spawned in. Invade primitives until you get colonization access to all 3 climate types, then stick the rest of the primitives in observation posts for covert infiltration. DO NOT take protectorates or vassals, you should be the ONLY empire other than the FE's until the War in Heaven breaks out. Keep expanding and only build a 25-30k fleet to take out any Leviathans you need (particularly the Enigmatic Fortress), but do not build any more. Once you have all EF tech done, focus on expanding as wide as possible. The goal here is to get an ungodly amount of spaceports. While you are doing this, your mineral economy should be very strong. Have one spaceport qued for battleships. This will be your mineral bank. Que up hundred of them. Dump all excess minerals you arent using into this spaceport in the form of battleships. When one battleship is about to be built, right click it to cancel the order and build another one.And now for show. Once you have around 300-400 battleships qued, thats when you strike. Pause the game, cancel a few battleships to put you at mineral cap, then start spamming every space station you got to start making corvettes and cruisers (I normally dont build a lot of battleships or destroyers, but I throw a few in there). Rinse and repeat until you've dumped all the minerals you had for the battleships in one space station, into hundreds of cruisers and corvettes que'd up across dozens of worlds. The point behind this is to raise a fleet WELL past the trigger for a Fallen Empire awakening so you don't have to scramble to build a fleet able to challenge them. Once the war breaks out, choose neither side. Then, open up your Demographics screen (a tab under government) and select "create vassal". Once you have some random planet as a vassal, release them as a regular empire. Almost immediately you will get a pop up to create the League of Non-aligned powers (you do not need federation to be researched, it will actually give you the tech for this). Say yes and then invite them to Federation.Now its game time. At this point, all the work is really behind you. If you've planned accordingly, it should be no different than any other war you've fought against a Fallen Empire or Awakened Ascendency. Catch their transports out of position, liberate the worlds they conquer, build fortress stars to catch them, catch their reinforcements and research the debris, bait fleets with smaller onces to accomplish other objectives, etc. Defeating the first Awakened Ascendency will end the War in Heaven, but you will still be at war with the remaining AA. Defeat the second and BOOM, you've got it.UPDATE: As of 1.6 (Adams), enigmatic fortress no longer gives access to all its tech, only one random. These techs are still incredibly useful, so even with the nerf, consider the enigmatic fortress a midgame priority and its system should be of strategic importance before the WiH breaks out.Reference: Abraham Lincoln