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The Ballista is certainly a useful unit. But it can be quite inconvenient at times. For example, in Heroes of Might and Magic III, it can attack a unit affected by the Blind spell, which will remove the spell – not ideal. However, in Heroes of Might and Magic V, I also like the Healing Tent. The Necropolis hero in my avatar has it very well developed! The ability to revive units on the battlefield is very helpful (which you won't see in Heroes of Might and Magic III).