Sacred Tree

Hello! I'm playing as the Knight. I went through the Necropolis on the right, heading towards the fountain with doubled mana. However, the Elves caught my hero without any troops, so I had to revert to a previous (distant) save. Then, I tried a different tactic: I figured that as long as the Voidwalker on the right was alive, Adrian could defeat the other heroes. So, I sent Kaspar against the Orcs, captured their town, and then used Adrian to defend. After clearing the map with Kaspar, I brought Adrian to the Voidwalker, but he was gone (the game asked: "Are you ready to fight?", but there was no battle, and no figures were present). The only thing I did beforehand was try to approach with a hero from the tavern twice. As a result, the Necropolis town was taken without a fight, the purple creatures are spawning there, but the mission wasn't completed, and the troops guarding the border haven't disappeared. I don't have any mods installed, and I cleared everything before starting the game. Thanks for the map, it's great!