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Hehe, yeah, it's a bit funny, but not because you can't complete it, but because you're "too scared to make a move." Honestly, I completed it on my tenth try, but when I did, I realized that my chair was wet... from sweat.
So, I suggest you immediately look for the path to the keymaster's tent in the west. If you don't know where it is, check with the mage whose house you encounter along the way. If you can't find the passage, don't worry, just keep playing the mission until you do. Are you a good tactician? You'll often encounter monsters that you can avoid, but it's better to defeat them right away – save time. North of the tent is a Temple belonging to enemy heroes – that's a trap, immediately run south. Did you enter the tent? Go through the portal nearby. East of the portal exit is a hut – open it and run into the Dungeon. Next. If you're being chased, it's better not to pay attention to the monster dwellings. Run to the exit. Now comes the saddest part. As soon as you exit the Dungeon, a demon-competitor will attack you. He has a minimum number of troops, but if you had to run away from the chase, you also have few troops. You kill him – the mission is complete. When I first entered the Dungeon, the chase was almost right behind me. I flew through the Dungeon, not paying attention to the chests. This saved me. An enemy was flying three squares away from me, he was picking up chests, which gave me time to run out of the underground.
Another point – if you have the Logistics skill available during the appeal, it's better to take it – it will be useful not only in this mission.
What a post I wrote!