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I liked it. A cohesive, unconventional plot, and the locations are great (especially the banks of the underground river). Unfortunately, I read the comments at the beginning and decided that the campaign might be too difficult, so I chose to play on Veteran difficulty (I don't like replaying), and that was a mistake. After the second mission, it becomes very easy. It's not clear why the AI behaves much more stupidly than in the original game maps. In the last mission, it sent heroes to their doom who my level one heroes could easily handle, and it didn't even build the second blue Castle (in general, I was winning easily). In the third mission, it was like swatting flies – a walk in the park, but I was able to explore the entire map calmly. Something needs to be done about this. As for the inability to dismiss auxiliary heroes, yes, that's annoying! It's doubly frustrating because there's a bug/non-bug with this entrance to the underground, where they're needed underground but completely useless on the surface. This entrance is really poorly designed; if you don't reach the entrance at the beginning, the "dialogue" won't start, and you won't be able to go back. After the dialogue, a script should probably trigger after certain conditions are met and open a normal path. The Necromancer was doing great, and the main character teleported to him just out of boredom. But I'm not sure if it's a good idea that the only way to reach Mehmed (or whatever his name is) is by using the town portal. If that's how it was intended, it would be nice to integrate it more harmoniously into the plot. Overall, it's a very enjoyable campaign. Many thanks for your work!
P.S. And yes, about the Grails – they are buried in a way that provides enough clues. In the second one, the edge of the map is obvious; in the fifth, there are swamps, trees, mushrooms, etc., so there are enough clues. The developers shouldn't be criticized for allowing the digging. After all, Save/Load hasn't been removed, and if it's acceptable for battles, then it's also acceptable for the Grail. And for true completionists who don't reload, there's a special ability, even if it's a bit of a waste to invest in, but at least it's done properly.