Demon invasion.

I’ll continue… I returned to my Castle, gathered all the reinforcements, and went back into the dungeon, where I found the Ring of Swiftness and obtained the Staff of the Underworld. There, Keegan caught up with me, but despite the high difficulty, I defeated him without much trouble /attachments/52398/>. Grobok had also been chasing me through the dungeon for a long time; several heroes were bringing him reinforcements, so I decided to run further away. I sailed to the former castles of the purple faction, took them, and Grobok was still stuck in the dungeon, trying to gather all his troops together. So, I decided to go to his territory, cleared out the garrison and 600 Cyclops at Tom Dark without any losses. I captured all the cities, visited all the upgrade locations; I had 47 attack points, and after a week, Grobok self-destructed because he didn't have a Castle (it's almost disappointing; I will definitely replay and fight him). Or maybe defeats shouldn't be counted when there is no Castle. Screenshots of the build-up and final stage are attached (there are some extra perks; I just didn’t have enough money for the Mentor): https://i.imgur.com/2eY4DjZ.jpg, https://i.imgur.com/scsGvQ7.jpg

UPD. It seems I figured out why Grobok was acting so strangely in the dungeon. He either doesn't have the ship summoning ability or he somehow doesn't want to use it. I just checked – I moved a secondary hero with a ship to the exit to the surface where the Emerald Dragons were, and he immediately ran there and sailed to capture my Castle. Whether this is a bug or an intentional design choice, it should be fixed