Auto-translated
Major Whirlwind, you, like me, probably chose the wrong course at sea. I ended up on an island with a demonic prophet. He sent me very far away. As a result, in a battle with an orc, only 24 spearmen survived. But in this battle, the losses don't matter. After the battle, the knight turned into a demon with an upgrade from level 3 and a new army.
In the new army, there is one demoness. More than enough to take care of the cyclops (even two) that are blocking the way for those who want to join Sareth's demonic forces.
After receiving the new army, I visited the demonic prophet, who asked me to get an artifact for him. I decided to return to the starting point to visit the fort and the mercenary camp. I discovered burning ruins of a knight's castle. I also visited the mentor. He also asked me to bring him an artifact. I couldn't, because during the upgrade, I didn't upgrade Sareth's climbing skill. The artifact turned out to be at the top of a mountain near the mercenary camp. What the eye doesn't see, the heart doesn't grieve over. This artifact wasn't even in the shop. But I bought a tome of dark magic.
After improving the troops in the fort, I went back to the Dungeon for the artifact for the prophet. I also visited the arena. The prophet gave a significant boost to the army. I sailed to the Necropolis castle. The castle had a decent garrison, but no hero. Therefore, I took it quite easily. The last two green heroes drowned because they accidentally (or maybe not) ran into Sareth at sea.
For taking the castle, I received a powerful reinforcement and a key. After passing through the portal, I saw a hero who wanted to run away from me. I visited the Crystal of Revelation and chased after the hero. He turned out not to be alone. There were three more waiting near the entrance to the Dungeon. One tried to run away. Maybe I shouldn't have bothered with him.
I defeated them all and went into the Dungeon. There was only Arantir. After I defeated him, I was given a quest to choose a path. The choice: free Kha-Belekh or refuse. I refused. A cutscene played, in which Kha-Belekh promised to take terrible revenge on his son for the betrayal when he gets out of prison. End of the mission.
Outcome: Kha-Belekh and the Dark One are alive. There is an opportunity for a sequel.
A little north of the island with the demonic prophet, I found an island with a knightly prophet. If I had found it right away, I would have definitely received reinforcements with which I could smear the orc all over the walls (this is my assumption).
There is nowhere to buy troops. There is almost nothing to build in the cities. It doesn't take much money to upgrade troops. Therefore, you can spend money on buying artifacts without regret.