From publisher blurb:
This is our 37th installment of the one-page dungeon series. The objective is to create self-contained adventures/dungeons with all things necessary to spawn fun adventures on a single page. It is system neutral so it can be easily ported to any system. It shouldn't be much trouble to include it in any medieval setting.
In Tomb of the Opal King, the characters visit the burial place of a powerful goblin kingdom's ruler. He was a witchcraft expert known as the Opal King. He wielded a soul-stealing scepter that is the stuff of legends. The characters learn of this uncharted tomb from rumors and legends. The promise of legendary treasures and ancient arcane secrets is strong enough to call adventurers and tomb-robbers.
Denizens of the Tower! Here's a fantastic one-page dungeon. It's a self-contained adventure where everything you need fits on a single page. They are system-neutral so they can be easily ported to any system. While no system rulings are included, we made this one thinking of Shadowdark RPG. Still, it is neutral and can be ported to any medieval fantasy system/setting.