A rush strategy is unlikely to work.
But I can't imagine how a Necropolis rush would work. Kaspar is an exception because he's a machine. What can Necromancers do in the early game? Skeletons are weak, wraiths are warriors who rely on luck, zombies are slow, you can't rely on vampires alone, and you can't kill much with magic. Explain.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!