Tactics for Rampart.

I don't like fighting against Necromancers and Fortress. Everything is clear about Necromancers. But Fortress... it really annoys me. Magic is almost useless against them. These Pegasus increase the cost of spells. Even if you kill them. And unicorns protect everyone from magic. I cast a lightning spell on a Centaur, and the unicorn protected him. I really don't like it!!! Plus, Gnomes and Dragons with their resistance. And buildings are almost built on trees alone.