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Find the Diary Key in the Tomb, then use it on the diary in Her Ladyship’s Chamber. To reach the key, bring an ignition tool and light the candles that open the hidden path to Clara Epsen’s tomb. The key is not consumed, and the diary stays unlocked.
How to get the Diary Key
- Draft the Tomb. The cited community wiki pages do not establish a prerequisite for making the Tomb available, so this guide does not assume one.
- Bring an ignition tool. Inside the Tomb, use it to light the candles farther in. This opens a hidden path to Clara Epsen’s tomb.
- Take the Diary Key. It is in the secret tomb area beyond the candles. The Diary Key and Tomb pages describe this route: Tomb and Diary Key.
How to unlock the diary
Draft Her Ladyship’s Chamber and use the Diary Key on the locked diary sitting on the desk. The key permanently unlocks it and is not consumed. The Chamber and Diary pages identify the diary’s location and initial locked state: Her Ladyship’s Chamber and Diary.
If Her Ladyship’s Chamber is not appearing
The community-maintained Blue Prince Wiki lists several conditions that can make the chamber draftable. These conditions are wiki-reported, not confirmed here by official game documentation:
- Reach Room 46.
- Open Lady Epsen’s tomb; the wiki says this condition applies immediately.
- Reach Day 12 with Veteran Mode off.
- Be before Day 8 with Veteran Mode enabled at the start of the day.
These are alternative eligibility conditions reported on the Her Ladyship’s Chamber page; the exact platform- or version-specific behavior has not been established.
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What the diary is for
The diary contains Clara Epsen’s notes about sleeping in different bedrooms. Its final drawing offers a clue for the Throne Room puzzle: the community wiki describes the diary as the primary hint, though not essential to solving it. This is a later-game spoiler connection; see the Throne Room page if you want that context.
Quick Recap
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