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strengthening spells - I don't know, I haven't seen such an ability at all. Or maybe I've just forgotten.
3DogMZA - level 1, I agree, I won't say about the second one. I tested both archers. Crippling is only good at the beginning. But while there are few warriors, it doesn't trigger often. When there are a lot of soldiers, wounding is almost not needed anymore :) there, the soldier's effect depends on the number of troops. And the new ones are much better. The old ones have 2-3 damage, the new ones have 2-5 :)
3 are equivalent, 4 - I never build them, but if I were to build them, I would build the new ones)
5 - rather the new ones than the old ones. Because fireball combined with the fire mark is cool :) therefore, on level 6, I build fire lords - because they cast this very mark)
on level 7, the new ones are more interesting, I build them just because of that=)