Temporal paradox.

I played as the hero and completed approximately 4 months of the game, but not entirely. After unlocking and taking the second garrison of brown units, it says that the quest is not completed, and the game freezes. Only two quests remain: to defeat Tolgar and capture his Castle. In general, it's some kind of mess, or is it just me? Overall, I liked the map (scenario, balance of power). However, the main hero is not very impressive. During development, I focused on dark magic, which is good because there is a mentor and alchemists (by the way, one of them in the Dungeon is inaccessible). Before the game freezes, the computer says that my hero is stronger than the enemy. Also, I had some trouble finding the runes; it would have been helpful to have a hint.

Added 23 minutes later
Replaying the battle with the garrison doesn't help, but increasing the AI's speed does. However, then Tolgar runs away, which means the quest fails, and in Tor-Hralle, there is a strong Kari with dwarven armor and immunity to Dark magic, who is impossible to defeat. In general, it's not getting any easier.