Sunshine is a mere 275 feet of solid stone above their heads. Extortionist halflings stand in the way. The party is LOADED with sacks of coin, and the cleric is slowly dying. Go.
The Halls of Arden Vul is by Richard Barton, Andreas Claren, and Joseph Browning, published by Expeditious Retreat Press. Purchase it here.
Old School Essentials is a restatement of the Basic/Expert (B/X) rulesets of Dungeons & Dragons, originally published in 1981. Check it out at https://necroticgnome.com/. Feats of Exploration achieved during this session can be perused here.
I use a fairly extensive list of house rules, culled from numerous luminary OSR sources. Find them, my Armor and Weapons List, and my Carousing Rules here.
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3d6 Down The Line