Death Structures

Under the Vampire's influence, the same Bone Dragons and Ghosts work perfectly ;) There are no fundamental differences from my usual tactics here.

There is. The point is to distract the Black Dragons from the heroes. Otherwise, they will burn them. For this, devils jump onto their backs without attacking. And the heroes from the square run to the corner so that the dragons cannot fly over. Thus, the Black Dragons will switch to the devils. The devils must be placed so that all 4 stacks can attack; otherwise, the one who doesn't have enough space will rush forward. Of course, the hero with VT should stand in the very back stack, as he doesn't retreat but casts spells. The rest, bypassing him, rush to the corner.

Dragons and ghosts will not be able to fly around the Black Dragons on the first turn, even with full tactics. And that means all the heroes are doomed. :)