Well if a mage or warrior has both spells, Last Hero and Magic Spring they don't need much mana to do it, 20 is probably enough. After the unit like dragonfly close to turtle has pass its round, you cast last hero, next turn magic spring, next turn last hero and so on, no need of mana regeneration and infinite time to do it.
Is it random of it's a fixed reward but last times I played the turtle I always get 2 scrolls, last hero and magic spring. Probably not a hazard.
Without mana regeneration and without Magic Spring It's not obvious at all that a low level warrior or wizard can do it. That's complicate but the Calinda method is then probably a best guess even if it has a random part.
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