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It's been 61 months on the "School of Might and Magic" map. I'm still testing my balance mod on the "Hero" difficulty level (neutral creatures increase by 11% per week). Thanks for the advice. I'll try it out today. And if possible, I'd like to ask another question. - Today, I added the "Earth Mines" spell from the Summoning skill tree to the Assassins (Dungeon). The game launched, and the map loaded successfully, but when a battle starts involving this unit, it crashes to the desktop with an error. However, if I replace SPELL_LAND_MINE with any other spell, everything works perfectly. Does anyone know what's causing this issue and how to fix it?