The Lanvernite Succession
The Oaken Library is deep in Moon Forest, in Silverwyn. It is maintained and guarded by wood elves, and it contains a priceless collection of ancient books. Most of the books are written in ancient languages, and only the librarians are able to find the books most relevant to a given topic.
The fee for library access (including finding books and translating them) is 15,000 gp, but the elves offered to accept a side quest as payment. One such quest involved killing the Wolfswold Chimera, who periodically terrorizes the Moon Forest elves. Another involved ferrying packages to and from Jonas Fletcher, deep in the Keystone Range.
The PCs’ contact at the library is an old elf named Marlon Sunbranch.