A collection of old history books containing the following potential adventure seeds (each requiring a downtime action to investigate):

Realm of Faërie (many thousands of years ago)

Adventure seed: You believe you can determine the location to an entrance to the ancient underground dwarven realms with a little more concentrated study (a downtime action).

Rise of the Eilvalorian Kings (several thousand years ago)

Adventure seed: With a bit more study, you believe you can locate one of their ancient cities.

Hundred-Years Winter (a thousand years ago)

Adventure seed: You think you can locate the site of the final battle with a bit more study.

Decline of the Eilvalorian Kings (several hundred years ago)

Adventure seed: You believe you may be able to locate one of their last great tombs with a bit more study.

Time of the Empty Throne (a hundred years ago--now)

Adventure seed: You believe you may be able to locate another one of their last great tombs with a bit more study.