Juliace the Librarian
The book, unfortunately, is unreadable. Corra suggests that Juliace will know what to do with this.
Fast Travel back to Radiance.
Head to the quest marker. Juliace is on the far end of the temple.
Speaking to Juliace, he says that the book has a ward. But conveniently, he says Lightbringers can remove the wards.