Heaven’s Key prophecy

"Heaven's Key in the Expanse sleeps. ""To be uncovered by those who seek.""The night shall fall, the dark shall rise.""Mortal races look East unless the light shall die."A simple passage in a collection of prophecies made hundreds of years ago. The book itself is a collection of spoken histories from a druidic tribe by an apprentice chronicler by the name of Aldous Plumbus. The actual seer who received and spread these visions remains unknown.