Dima Sarbash
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I currently have a pirated copy, so here are the improvements I remember:
archer-crossbowman-crossbowman,
fairy-dryad-dryad...
I don't remember anything else...
Peasant-militia-scout
Monk-inquisitor-fanatic
Ent-Ancient Ent-Blue Ent
Bone warrior-bone archer-skeleton
And that's not all.