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Agree to help Codrin poison Ambrus.
Only what a source states. A quest with nothing listed is a quest whose rewards are unpublished, not one that gives nothing.
The two sources imply different orderings. One chains it after The Gilded Gauntlet; the other's reward — Ambrus starting the duel poisoned — only makes sense if it resolves before the fight. Recorded as following the duel quest, which is how the chain is written, but the ordering is unverified.