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In the update, Vittorio and Talanar's armies will become fixed (independent of the difficulty level). Frederick and Orion will receive only small reinforcements on top of what their faction's capital accumulates by the time the script is activated (however, they will respawn with an army from that time). Miv and Ilfina will have their growth rates slightly reduced, and Rutger will also become fixed. In other words, you can chill in the underground for longer without worrying too much about the growth on the surface.
You can kill Sareta, but it won't affect the game in any way. He doesn't have any scripts of that kind.
I like writing long posts.
The epilogue to Ashan's story is the Dark Messiah of Might and Magic game. It tells the story of Sareta. It ends with the choice of either freeing the demons from Shi'o or betraying the Father. The main villain there is Arantir, and he essentially appears as a character for the first time in that game. The P.O.s came out later. It's a good game, by the way. There's also lore from the now-defunct online game, where Sandro was defeated. And a couple more games, not counting the sixth and seventh installments.
The entire plot of my maps takes place two centuries after Biara's death, and it is assumed that Sareta chose his father's side