Uninvited guests.

The dark elf visited about 3-4 times during the early game, but then stopped. I was even happy about it – he stopped bothering me with his magic. The map playthrough took a while. I defeated the demons, dwarves, and necromancers. Now I'm heading towards the dark elf. He's standing near his castle in a narrow passage, and a caravan is blocking his path – it looks like he's been standing there for several months. I check his troops – five hundred red dragons, five hundred black dragons, one and a half thousand witches, etc. I was stunned, so I ran back to my castle – and there, after destroying the catapult, I simply positioned my troops so that his dragons couldn't fly over the walls. And the gnome specialist helped – I managed to withstand the attacks.
I'm not sure about the "screp" – the first attack of the "shabash" was painful, but after that, I had enough money to rebuild.