Uninvited guests.

The map is very interesting; I played through it with three factions on Hero difficulty – Necropolis (very easy), Academy, and Haven (not very difficult). Now I'm thinking about how to play with the Sylvan faction, but I don't know how to do it yet. I'm building Faeries, Dancers, and upgraded Archers, and in the early third week, the computer comes and easily defeats all my archers with magic. I don't know how to defend against magic; I would be grateful for any advice.