What does Grit do in Renowned Explorers?

What does Grit do in Renowned Explorers? - Interior of modern office lounge zone with sofa and armchair with table near window next to TV on wall and neon signboard with text do what you love near door

Maybe I'm just missing this somewhere, but I can't figure out what the grit stat does in this game.

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Renowned Explorers International Society How To -- Understanding the Meta-Game

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