A large cocoon grows out of the Tree in the space of room 6/23. Inspecting it reveals dust and dirt build-up indicative of it having grown here for a very long time. Scorch marks on it suggest someone or something attempted to burn it and failed. A small tap has been drilled into the side, and it has collected a single dose of the bug soup percolating inside the cocoon.
The bug soup can be used as a crafting material. It can also be drank by a single person. If drank, that individual must make a Saving Throw vs Polymorph. On a failure, they grow a pair of moth-like antenna and develop a dietary need to eat fiber cloth. On a success, they instead tap into the gestating bug's memories of the Tree. The successful adventurer can ask one question about the Tree and gain a true answer.
The tap refills over weeks or months.