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I completed the campaign with a hero. I really liked the plot. First, I finished it in 100 days, exploring all the land on the map and collecting all available units. As a result, the final battle simply turned into a one-sided beating.
Then, I replayed and, immediately after destroying the meteorite, I simply took a castle, which reduced the time by 17 days – the last game became more interesting, but it was still won "by a landslide."
Suggestions:
1. Increase the castle's defense by at least 2 times, and assign a hero with at least level 20 to guard the castle, instead of level 15.
2. Come up with some kind of quest in the sea; otherwise, it's unclear why we need to take the shipyard from the vampires.
