Jiub's Opus (Page 2) is a quest item in Skyrim: Dawnguard. It is needed to complete Impatience of a Saint
Location[edit]
Go North from where Valerica is and through a small corridor. Jiub's Opus Page #2 is at the base of a chest near a dragon.[1]
Visual Help/Screenshots[edit]
Look for this tunnel north of the castle: