A hole in an old oak tree leads characters down to a maze of twisting, root-riddled passageways, the chambers of an ancient wizard-complex, and the banks of an underground river where once a reptile cult built their temples.

A classic expedition into the Mythic Underworld for characters of 1st to 2nd level.

• 60 keyed areas, rumour table, loot summary, dungeon background info.
• Keyed in a quick-reference, bullet point format.
• Statted for Old-School Essentials (B/X), usable with any vintage adventure game.

The Hole in the Oak can be linked with The Incandescent Grottoes to form a large, 3 level dungeon with over 115 keyed encounter areas!

Requires the free Old-School Essentials ruleset.

Adapted for Fantasy Grounds by: Oso Buho.