Tyranny of the Sun is an ancient prophecy foretold in the Elder Scrolls by Arch-Curate Vyrthur, who became a vampire thousands of years before the events of The Elder Scrolls V: Skyrim. The prophecy is written between three separate Elder Scrolls. The inscription denotes a ritual that requires a Daughter of Coldharbour as a sacrifice and the bow of Auri-El to permanently purge the world of sunlight, allowing vampires to roam unhindered.