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The second tier consists of pikemen. Ballistas are slow, while pikemen are quite durable and have a ranged attack.
For the third tier, I choose monks. They compensate for the lack of archers in the second tier, and they are quite durable with a protective aura.
The fourth tier is more like angels. The situation is similar to Chaos with hydras and dark knights. I prefer quality over quantity. Resurrection will also be useful.