Worshipper – “Conquest” [Campaign 2, Mission 3]

Magic resistance is present, but it doesn't work very often. I manage to eliminate the archers and all or almost all of the druids each time (a couple of dozen remain), leaving about 50-75% of the dryads and dancers remaining, i.e., 2-4k each, and I completely eliminate either the dragons or the unicorns, but only one of them.

Added 1 minute ago
By the way, when I attack with Agrael, my imps steal all 70 mana units from Talanar; the druids, if they remain, do not transfer mana to him, but he still constantly casts evasion. How can this be explained?!