Poet's Gut

Missable, and stat-gated: you have to nail all four back-to-back skill checks while reciting poetry to the old woman, and a single fail blows it. You'll want the Scholarship and Charisma to clear them (roughly Scholarship 20 / Charisma 19), so kit out for it - dress for Charisma and take a boosting potion if your numbers are short. Save right before the recital so you can retry the checks.