Page from Dolores's Journal is a written note found in Death of the Outsider.
Transcript
10th Day, Month of Timber
Before I can seize my immortality, I must deal with the mess Cienfuegos created. Outsider take that traitor! The cult can never know that he stole the documents they entrusted to me. If the information about their secret Void entrance fell into the wrong hands, it would destroy everything. My plans would be ruined. No! I won't let that happen. Those Oracular Order Sisters have closed off the Royal Conservatory, but that's a minor obstacle. As I know well, there's always a way past the most secure defenses. I just need to think of it...
Location
This note can be found on the briefing board upon waking up at the beginning of the mission The Stolen Archive.