gremlins are the only creatures with infinte mana...
the AI also cannot regen mana per round, that is, they use up their mana and thats it. afterwards you just mine mana from some weak troops you let live and resurrect all of your troops.

How do you do that?

kill all but one or so of an archer (ideally one that hits multiple hexes with one shot, or has very short range), or better yet, a NO RETALIATION enemy troop. Put some troops near it, case magic spring on your unit and let it be hit. you get 5 mana per hit.

I don't understand why do you keep calling it magic spring when it's not called that.

it is in my version, i just checked and it says "magic spring"
There was a bug where defeating the giant turtle says you got two scrolls, one of which was "source of magic" and you did not actually receive it, well: 1. it was fixed so now you receive it.
2. it is a translation artifact, everywhere else in the game it is called "magic spring"

I have it named "Magic Spring" as well, since the demo...

A little note about some pet peves of the A.I.:

They attack the summoned thorns too often [possibly why I only found one place that I could get them all game]

The enemies use their own dragon fire extremely effectively, however, unlike heroes, the enemy does not use YOUR dragon fire against you [on purpose].

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Other than that, I think the AI does a good job. Let me ask you a question: does it make sense for everyoen in the game to know some good AoE spells? Did you find fireball around every corner? Why should all of the AI have fireball? Granted it does seem that all AI's have pigmy...

In my (european release "Nobilis") the "Magic spring" spell is called "Source of magic".

I personally love the AI doing a heal on the UNDEAD. That's why auto combat can be a bad thing.

Are they? They start with 10 or 12 men, never recruit anyone, never use magic, and, e.g., free Violetta? I would pay money to see someone do that.