I don't know why everyone is so upset about the second mission. I started it easily; the initial scouting only required a little bit of brainpower. Then I went underground, gained some experience, captured mines, and generally got settled. Meanwhile, Markel set out to sea, and luckily guessed that he needed to sail west. He found the Sphinx (failed the test, laughed at the 999 Phoenixes), reloaded the save, passed the test, took the hero's armor, and generally got himself sorted out.
Then an Orc arrived, but my army was already too strong for him, so he retreated (screenshots 1, 2) across the sea. I managed to get the old man to Srando, cell by cell, and transferred the army to him. The Orcs retreated home without a fight. I started clearing out the underground and a Demon appeared. I REALLY SHOULDN'T HAVE GIVEN HIM PILLAGE. I replayed, ran to the castle.
THE DEMON ALSO RETREATED and went to the Orcs. While I was cleaning up the surrounding territories and the underground, the Demon had already thinned out the Orcs considerably and was left with a ragtag army (4). The Orcs also took a beating, and half of their army simply died. At the same time, I already had a legion of undead (5), while the Demon had only about 50 demons in total (6).
There's not much to tell after that; the Orcs huddled in the corners, hiding from my huge army, and I spent an hour, maybe even two, just clearing the islands of the remaining Orcs and collecting the buff tokens. Special thanks for the mentor.
From a story perspective, and especially the Eclipse element, I really liked it; everything is great, even better than the original Campaign, but the technical part let me down; the enemies defeated themselves!
https://imgur.com/a/NXs4HCp - screenshots