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Speak to Gremla in the middle of Laslea Glen.
Only what a source states. A quest with nothing listed is a quest whose rewards are unpublished, not one that gives nothing.
Flagged as carrying a minor story consequence. What it is, and which branch causes it, is not published.
A ten-fold XP range means the outcomes differ substantially, and the source does not say what separates 75 XP from 850.