Necropolis and Demon.

Are you laughing at me? Do you think I'll just sit in my Castle and wait for your overpowered demon to arrive? (Which you can hardly train to level 20 without losses, and it's doubtful that it can become so strong in such a short time). And by that time, your imps will have been thoroughly beaten up by the mobs, so they won't be able to steal a hundred mana. A ballista certainly won't destroy half of the squad, don't even dream about it (the Necromancer has half of his perks dedicated to defense). Your Deleb is only good for clearing out neutral creatures, and even then, only melee units. You can't eliminate the entire plague with a single tent; it only affects one stack, and, as you say, it can be reapplied, unfortunately. Don't worry about the skeletons and zombies; they will survive anyway. The mana problem has always been, is, and will be a problem for the Dark faction. And if you have 30 mana, 45 won't make much of a difference. Furthermore, for those who like to play tricks, there is a quite effective way to deal with such players. You just need to approach their Castle. Then, if you leave it, you lose everything. And in general, we're not talking about them, but about demons. I think everyone understands that the Dark faction's gameplay revolves around rushing and trickery. In general, such games, where some players tried to rush me, like Hafiz or the tricksters, usually ended in failure because I know how to counter rushers. If you're planning to clear the surroundings, who will guard your Castle? And for the Necromancer to inflict significant damage on your army, it's enough to develop a secondary hero (up to Plague and Spiritual Link) and leave him in the Castle, along with the liches. Meanwhile, the Necromancer will capture your Castle, gather an army from it, convert it to undead, and then how will you defeat him? And in general, normal people don't play like that. Only cunning rushers on the quick-play mode play like that, to increase their rating at the expense of some newbie.