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Three birds a stone makes no sense and makes even less sense in English. The metaphor is two birds, one stone. Which means to get two outcomes from doing one thing.
He’s not even mentioning 3 things. Each set of things had a benefit.
Extracting stones and making more minions is 1 thing as they all involve the same actions, defeating monster kind.
Getting points from doing the above means he can also get rewarded. That’s 1 more thing.
It’s still two birds with one stone.