As a reminder, it was also mentioned about the material for the "otman" (presumably a specific unit or creature). The idea is that in the first round of battle, griffins should attack someone other than the vampires. Massive slowing in the first round allows you to curse the griffins in the second round, which they are quite susceptible to. Adding spells that increase the damage of the vampires, due to their ability, is quite effective. Of course, there should be a sufficient number of vampires remaining during the battle, and to achieve this, you can also enhance their defensive properties.