Also, feel free to ping me with anything to prioritize. This is going to take a long time.
C: Hedgehomes
Named for both their living construction and passing resemblance to hedgehogs, "hedgehomes" are traditionally grown straight from a Behemoth root and roofed with her branches. Their tight, regular construction is a subtle sign; hedgehomes are home to some of the most powerful druids a visitor's likely to encounter.
The health of an undercolony's Behemoth sprout is of utmost importance to its own survival. While it's true that the Behemoth's roots are a veritable nutrient superhighway, each colony is expected to contribute as much as they take, and this can typically only happen while the above-ground portion is photosynthesizing at max capacity. Thus, the sprout has an assigned keeper who devotes their day-to-day life to tending it and its surrounding child-jungle, coaxing it to be as large, powerful, and energetically productive as possible.
Being a sprout-keeper is seen as an honored position, albeit with some politics behind it; battledruids who proved themselves on the frontlines but struggle to reintegrate with civilian life may be assigned to a sprout. The work is physically demanding, well-scoped, protective, and traditionally comes with a high degree of independence. Some keepers have little to no contact with the undercolony, save when things go wrong. Others are highly social, and will use their druidic skills to construct an entire little village of hedgehomes or even found a full clan.
If you can locate the hedgehome and the keeper signs you to approach, they may be an excellent source of information about the health of the undercolony, if not its exact workings. Or they may know quite a bit! If you don't see the hedgehome, try not to look for it too hard; if they don't want you to see it, it's for a reason.
J: Unclaimed Cavern
Nature dragons tend to lack Earth dragons' skill in tunneling. Thus, the discovery of a natural cavern is particularly exciting, as it represents a "free" expansion on the oft-claustrophobic confines of the rootbed. Cavern colonization is a slow process, but intensely watched. As the air equalizes and founder-lichens break down the surface stone, debates rage in nearby colonies. What will it become? A reservoir, a garden, a wild area? Who will plant it? Who gets to maintain it? Could we import some of those new hummingbird vines, or would they be too reliant on the Behemoth? Could we excavate a skylight? Are the mushroom people going to try claiming dibs?
The depicted cavern is on a downslope from an archivist root city, and will likely become a public park/reservoir, assuming nothing moves in first...