A few of these ideas dont really sound like 'mega events' as I understand the current mega events to be.
A lot of the cosmic ones are more 'megary' (if thats even a word *feels silly*), but seem either OTT (a wave that destroys EVERY ship in the galaxy) or very small mega events like supernovai, which will only destroy one star system.
I like the idea of meteorite impacts, but these arent really galaxy-wide like normal mega events, they seem more like morality choices similar to the breakup of the moon colony or the like.
The galactic shake-up (where planets just are simply rearanged in new places) sound a bit silly, but its definately unbalancing and could cause alot of turmoil where each civilisation is trying to reistablish control, and wars will almost certainly break out.
To be honest I dont agree with terrorist attacks within the game as its a bit morally subjective. Sure its a game, and its not real, but terrorism within the game should be left out, purely out of respect.
Here are my ideas, and by all means, comments and criticisms are welcome.
The civil war event (by assasination, military coup, etc etc) sound like a super idea (there is a thread dedicated to it in the ideas section). This would really shake up the balance of a galaxy especially if it happened to you. But, you could also make the civil war one of your goals. You can (by different means such as agents, bribery or war which errupts into another war because of unrest or whatever) try and pursue this to get another civilisation to fall into civil war, and as the empire tears itself apart from the inside, you move in and capture whats left. This may happen to you, so dont expect it to be an easy ride through diplomacy. This adds a whole new depth to diplomacy, espionage and destabilisation, war and economics. This civil war creates a new Civ maybe with different ethics to the one they split with.
Black hole event.
A black hole appears somewhere in the galaxy, and it has a radius of 5x5 parsecs. Anything within this parsec is destroyed. Yeah even planets are erased from this cosmos, but stars are not. Each turn it moves off in a random direction until it either dissipates or moves off the map edge. This could really shake up the game, as ethics come into play. Do you spend alot of money trying to rescue your people in ivacuation ships, or just leave them to their fate. If its happening to another civ, do you aid them, or take advantage of the chaos and invade while they are weak? Does another civ? Also diplomacy, as you try and convince other civs to do their best to help you if they can. You can also try and get a ship outfitted with a black hole gun (if researched) to try and 'cancel out' the black hole, but it will not always be successful.
A fun one here: Mad scientist.
He is trying to create a weapon which could seriously aid an evil civ, destroy a huge amount of the map, hold a civ to ransom, or somethingelse befitting to a mad scientist. You have to try and find which lab in which planet (by using espionage against yourself in a special slider which appears only in this circumstance) and then send an agent in to try and stop him. You can try and reason with him, pay his ransom, or just blow the planet up etc.
Robot Rebellion ala I, Robot.
Your/another civs industry is crippled until you can quell the robot uprising.
You have to cut off the (random amount) planet/planets that have rebelled then invade them and retake the planet. The planets are still 'yours' and no new civ comes of it, but those planets are doing absolutely nothing for you apart from sapping your economy.
Very similar to black hole, but does not completely destroy a planet, but instead is similar to a mass driver invasion of a certain amount of planetary improvements and pop. within its radius. Not everyone will die, not every ship/starbase will be destroyed, but the area of effect is much larger. I prefer the black hole event as its much more destructive.
Pirates that do a bit more than just randomly blow stuff up.
They try and steal techs to sell to other civs, can be bought for a few turns to cause a bit of havoc to another civ, try and steal freighters/constructors. They might try and blow up a galactic achievement of yours, try and steal food (you can give them some to gain 'pirate favours') or anything else the devs can code into the game. That sounds like a cool form of 'minor race' that work like the Korx but better because they have nothing to lose like the Korx. Ocassionaly you might find a wierd looking starbase only to find its a pirate stronghold and you can destroy it, arrest the pirates for a morale and economic boost, or you can buy them if your feeling mischievous.
'Tyranids' or 'space locusts'
Anyone here who has played, plays or knows about Warhammer 40,000 should know what I'm talking about. They are galactic locusts. They are a hive mind controlled race of bio-engineered insects and creatures who basically invade a planet, destroy it, eat everything on it and leave to another one. Of course the devs will have to think up another name that tyranids but the premise will be identical. The planet they invade (because they scour it of its atmosphere, its water, biological and non-biological matter and consume it) will be reduced to a class 0 planet. You can fight them, they have good soldiering ability, and ALOT of ships. They will invade randomly, and often invade one planet, float around, move the other side of the map and invade a planet there too. This idea sounds really cool, as you can (if you think you can benefit from it of course) leave them alone and see if they invade other civs, or try and destroy them.
Whats also cool is that they reproduce lost ships over time, so if left untouched after a big war they will end up being just as powerful as before.
So, ive wrote an essay... what do you all think of my ideas so far?