Druid Enclave: Players' Guide (2019)

From publisher blurb:

This players' guide is intended as a companion to the Druid Enclave city-setting adventure.

The Druid Enclave is a walled compound situated amidst a magical forest filled with all manner of creatures and monsters. Within is a complex city-setting spanning multiple, sprawling, underground levels.
Druid Enclave is a massive city-setting rich with intrigue, side quests, and a shadowy over-arching plot that ties into the events of Dark Obelisk 2: The Mondarian Elective mega-adventure.

Druid Enclave may be used on its own, or as a precursor or suffix to Dark Obelisk 2.

Although set in the rich, new world of Aquilae, the adventure is seamlessly adaptable to place within any existing campaign setting. Its contents scale to PCs of any class level and difficulty.

This mega-setting consists of more than 150 highly-detailed, full-color maps, describing the city itself and 4 underground levels rich with secret caverns, private chambers, long-lost caches, and treasures.