Walkthrough tips, Discussion of Campaigns [Heroes 5]

I already tried, but I couldn't defeat the Necropolis faction (for some reason). But still, even though he has 5-6k skeletons, he uses Phantom and by the time I get to them, he has already taken out my archers or druids, or even my ogres or unicorns. It's really annoying. I don't have Phantom or Resurrection, and in general, Faedan's magic is a bit weak. He focuses on speed and luck. I don't even know what to do with this guy. If he didn't use Phantom, there wouldn't be a problem. And phoenixes are really useless. I wasted a slot for them for nothing.