Fallen Enchantress difficulty level explained?

Is there an in depth description of all the changes in the game from one difficulty to the next?

I tried to google it but found nothing. The Mouse Over tool tip does not tell you much.

Its like at expert: Says that enemies get an economic bonus and that sovereign if buffed.

So Ok I think they will research faster, build faster get more gold/mana and the sovereign will have more HP etc.

But in truth I noted more things than that. All enemy troops seem to have 8 Bonus traits in total, while you are capped at 3.

Also, it seems the heros you recruit are nerfed compared to say normal.I noticed they have less bonus traits.

 I am playing Legendary Heroes btw.