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I think this can be done indirectly.
Remember the campaigns! For example, in the first one, playing as Isabel...
There was a mission where Isabel passed through a garrison, a cutscene played, and the mission ended after that. You could do the same!
That is, after the garrison, place the Axe on the map. Just for show! :D And when the hero passes through the garrison, end the mission! Like, he found it!!! :D