"Necropolis" - changes to creatures of levels 6-7.

Okay. I've already fixed it properly. I increased the average damage of the ability by approximately 2-2.5 times for a range of 1 cell. The damage decreases further away. I created textures, icons, and added/improved descriptions. All that remains is to fix one annoying bug with the Dark Knight – on an advanced map, he stands in an awkward pose. And, the animation of the Death Knights while moving, although, in my opinion, they fly perfectly well.