So, I completed the first mission. What can I say? Perhaps the heroine isn't leveled up enough for the "Vampirism" skill to allow the vampires to fully regenerate. 158 units of ghosts helped with the resurrection of the vampires. But in serious battles, "Vampirism" (which I have as "Life Drain") didn't help much... Especially in the battle with Salvatore and his spells. In such battles, "Weakness" is more effective. The staff is very good; in prolonged battles, mana will be invaluable, and it reduces the cost of spells! Of course, you can clear the map calmly with these spells, but if the battle is already with heroes, then resurrection helps by about 30%. The most important thing is the ALTAR OF ENSLAVEMENT! I wasn't afraid to go forward. Well, I lost - I bought them back!! 0% losses! So, don't worry about it at all! The main thing is to build up to it, and preferably in two castles.