Another Borderlands adventure, this time one which has been fairly well-tested - The Barrow of the Woad Chief, a low-level dungeon near the "starting town" of Gosswold. The Barrow has a small (3-4 room) tomb area with low-level learning exercises inspired by Skerples, and then two hidden areas - the Den of the Woad Archon, who runs a sacred cave-farm staffed by Sentient Cabbages and bees, and the Water Shrine, the last active Shrine to the Old Water God in Loam Country, with traps, tricks, and treasure. The hidden areas include large roleplay/negotiation opportunities - the "lead" NPCs in those areas, the Woad Archon and Dissurath the Water Elemental, are both open to friendly advances (but there's a lot of money available if you're not friendly!). Click here for the public Drive folder with my Borderlands material.
As a "bonus", find below a list of Ancestries in the Borderlands, most of which I'd like to make into Race-Classes: