The Librarian is a minor character from the 1985 animated series She-Ra: Princess of Power.
She-Ra: Princess of Power
The Librarian oversees the Library in the Valley of the Lost. Although the mighty Hordak liked to claim that nobody returns from the Valley of the Lost, there have been some visitors to the Library, albeit that there visits were few and far between.
Even less often visited is the Inner Library, which had not been entered by anyone in centuries according to the Librarian. The books in the Inner Library are in a language not used in a thousand years.
And yet Hordak's accomplice Shadow Weaver must have used her magic to transport in and out of the Inner Library, where she searched out the Nameless Glowing Book to use one of it's spells.