Undertree Temple of the Elf Gods module details a nine room dungeon beneath a massive tree, with relevant random encounter and rumor tables. It's presented in a usable format with terse and evocative language.

What's Inside

• The tree above the dungeon has gemstone leaves, presenting an opportunity for substantial loot up front (I recommend combining it with your favorite random forest encounter procedure/table to add some risk to the reward).
• Below, a sickly dryad asks for help exterminating termites that infest the dungeon
• A secret treasury contains a blade that grants control over any fiend it strikes (for a terrible price) and a cloak that allows the wearer to travel to higher planes of existence
• Abstract giant termites devour structure itself
• A novel monster sucks religiosity out of holy ikons and belches belief-shattering deific suffering
• A table to randomly determine a human bone!
• There are also opportunities to eat glowing fruit and see what random effect takes place, learn the Rite of Moonlight Immortality from the statue of a goddess, and play with ambulatory lobster-shaped fungus.

The module also includes an elegant system-neutral character generator that makes whimsical characters well suited for any fantasy adventure (and especially this adventure).