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That’s what I meant by “mentor.”
Example: You need to take a garrison, but there are demons there, and they drained some of your mana. Behind the garrison is an enemy hero – a demon – and then there’s a castle. But you’re already out of mana. This is possible.
Another example: On the way, you encounter neutral creatures in incredible numbers. This happened to me.
After level 23, something like this can happen more often, and it’s mostly a matter of luck. It’s very rare to be able to fully upgrade the “Absolute” skill; at the most crucial moment, something else pops up.