NOTE: This probably belongs in the stories subforum, but it doesn't look like anyone would read it there.
So, I was playing your bog-standard average game, with all difficulties at their default levels, when I whittled the game down to one Citadel.
So far so good. The only major roadblocks were that the tier 3 and tier 5 classes sucked so bad I used the previous tiers (yes, even for the fight with Demonaica; I only died 3-4 times
).
Then, out of the blue, there came a lightning storm when I purified the last Citadel (the spell that disrupts cover). A bit of basic maths should tell you that the odds of a power-9 soldier surviving a turn on the Citadel with a lightning storm, even at max morale, are...unpleasant, to say the least.
So I moved the nearby soldier I had on standby out of the way, and basically derped around the map for a bit (I suddenly felt a lot less bad about turning into a bat and skipping entire levels altogether).
And finally, after four turns of mindless derping, the lightning storm was finally gone, and it was time to take out the final Citadel, and kill Demonaica, and...
NOT!
The RNG decided to cast ANOTHER four turns of lightning. Now this is far more than just a minor inconvenience; it sets me back 8 turns, which is more than enough for everything to gain a very significant boost in power. For example, I discovered, for the first time in my Demonaica-slaying career, the World-Map Auroch Warrior. In addition, my wimpy tier-4 classes suddenly became a lot less effective in the final battle.
Now, the important question: is the possibility of this sort of nonsense occuring unfair, or am I just plain unlucky?
I suppose that's for the devs to decide (I still won in the end, by the way. It's just that I didn't remember dying so much in the final leg).