All castles in Heroes 3.

1) If you ban Utopias and Pandoras, I believe the game will lose all interest. Perhaps in that case, it would be worth introducing restrictions, for example, on the conditions for using certain spells, etc., as is done when creating general rules for online games. Here, please follow the link and familiarize yourself with the rules. You can see that there are serious restrictions on the use of spells (for example, Dimension Door only once a day, collecting artifacts with "Teleport" is prohibited until the guards are defeated), and other limitations. But to globally prohibit Utopias and Pandoras means hopelessly reducing interest in the game.

2) Destroy an army of Nagas with overwhelming force on week 1 at 200%? I don't think this is realistic in an online game, even if you level up a hero with diplomacy skills. In general, on our portal, and not only here, due to compelling reasons, there is a practice of playing at 160% (the main argument is that development speeds up and, consequently, the real time spent online decreases). There are also restrictions on diplomacy. Join us!