Ranger - "Higher Vampire" [5th Campaign, 5th Mission]

Many have encountered the overwhelming darkness of the Nikolaev dragons. I can suggest starting the mission again, destroying 3 (or however many there are) groups of spectral dragons (then you will receive a message like "dawn is breaking") or exchanging a composite artifact in the seer's hut for phoenixes. But you shouldn't delay in dealing with Nikolaev either - from a certain point, his army begins to grow exponentially, and there will be no way to defeat 40, or even 50, thousand dragons.

It was easier in version 1.0 - Nikolaev could be killed using "Phantom," cast on archers.