Unicorn Empire

In mission 5, the demon-worshipping mages reduced my level to 1, and I can no longer gain experience. The experience bar fills up, and it says something like 1000/25000, meaning experience is being gained, but the level isn't increasing. It's impossible to complete the mission with level 1. Otherwise, thank you very much for the campaign; I would like to see more similar ones, perhaps for the Haven faction.