Library Of Ruina is Project Moon's 2021 deck battler, where you run a Library that mails out invitations, fights the Guests who accept, and turns the losers into Books. Every librarian is defined by one Key Page, which fixes HP, Stagger Resist, Speed and the Slash, Pierce and Blunt resistance columns, plus a deck of exactly 9 Combat Pages. Fights resolve as clashes: both sides roll dice at each other, the higher roll wins and the loser's die is destroyed, so damage is something you win rather than something you spend. Books drop the pages that build the next deck, which means the difficulty curve is assembled out of whatever you beat last.
Library Of Ruina features distinct areas with increasing difficulty. This guide covers every major location in progression order: what to do, what to get, and when to move on. For the step-by-step path, see our walkthrough.
Area Progression Order
| Order | Location | Difficulty | Key Rewards | Recommended Build |
|---|---|---|---|---|
| 1 | Canard | Chapter 1, one floor available | A Yun's Office Fixer Page 1, A Hook Office Fixer Page 1, first real Combat Pages | Floor of History |
| 2 | Urban Myth | Chapters 2 to 3, two or three floors | A Hook Office Fixer Page 2, A Backstreets Butcher pages, the four Lulu's Friend pages | Floor of History |
| 3 | Urban Legend | Mid campaign, four floors | A Zwei Fixer's Page, A Stray Dog's Page, Grade 8 and Grade 7 Fixer pages, Axe Gang Member pages | Floor of General Works |
| 4 | Urban Plague | Late campaign, six to eight floors | The Carnival's Page, Salvador's Page, Tamaki's Page, Will Make Fine Silk, Ink Over | Floor of General Works |
| 5 | Urban Nightmare | Endgame, all lower floors at high Realization | Star of the City access, Floor of Philosophy, Floor of Religion | Floor of General Works |
Canard: Starting Area
The opening rank, fought entirely from the Floor of General Works. Finishing episode 3 of Yun's Office opens the Floor of History, and clearing the Hook Office reception opens the Floor of Technological Sciences.
| Attribute | Detail |
|---|---|
| Difficulty | Chapter 1, one floor available |
| Key Rewards | A Yun's Office Fixer Page 1, A Hook Office Fixer Page 1, first real Combat Pages |
| Recommended Build | Floor of History |
| Key Equipment | Pierce dice |
What to Do Here
- Learn the basics of Clashes and speed dice. This is where you practice without heavy punishment.
- Collect starting resources and your first equipment upgrade.
- Clear all main content before moving to Urban Myth.
- If you're struggling, read our beginner's guide.
Urban Myth: Early Game
The second rank, where guests start bringing passives worth reading. Episode 1 of Streetlight Office opens the Floor of Literature, giving you three floors to rotate receptions between.
| Attribute | Detail |
|---|---|
| Difficulty | Chapters 2 to 3, two or three floors |
| Key Rewards | A Hook Office Fixer Page 2, A Backstreets Butcher pages, the four Lulu's Friend pages |
| Recommended Build | Floor of History |
| Key Equipment | Pierce dice |
What to Do Here
- Focus on mastering Light and page cost. It's critical from this point on.
- Farm for Pierce dice if you don't have it yet.
- Complete all objectives for maximum rewards.
- Prepare for the difficulty spike in Urban Legend.
Urban Legend: Mid Game
Reaching this rank unlocks the Floor of Art outright. This is the first tier where the Key Page pool jumps in quality, and where default Assistant Librarian pages stop being acceptable.
| Attribute | Detail |
|---|---|
| Difficulty | Mid campaign, four floors |
| Key Rewards | A Zwei Fixer's Page, A Stray Dog's Page, Grade 8 and Grade 7 Fixer pages, Axe Gang Member pages |
| Recommended Build | Floor of General Works |
| Key Equipment | Pierce dice |
What to Do Here
- This is the main skill check. Bring an optimized build.
- Slash dice becomes accessible here. Prioritize getting it.
- Master Stagger Resist and damage types for the boss encounters.
- Check our boss guide if you get stuck.
Urban Plague: Late Game
Guests here punish sloppy resistance checks. Finishing the Shi Association reception opens the Floor of Language, and clearing the Puppets reception after that opens the Floor of Social Sciences.
| Attribute | Detail |
|---|---|
| Difficulty | Late campaign, six to eight floors |
| Key Rewards | The Carnival's Page, Salvador's Page, Tamaki's Page, Will Make Fine Silk, Ink Over |
| Recommended Build | Floor of General Works |
| Key Equipment | Slash dice |
What to Do Here
- Full build optimization is expected by this point.
- Slash dice should be your primary, fully upgraded.
- Books and Reception invitations mastery starts mattering here.
- Farm resources for the push into Urban Nightmare.
Urban Nightmare: Endgame
The rank before Star of the City, which is itself the gate on the Floor of Philosophy. Clearing a single Star of the City reception then opens the Floor of Religion, leaving Impuritas Civitatis as the last tier.
| Attribute | Detail |
|---|---|
| Difficulty | Endgame, all lower floors at high Realization |
| Key Rewards | Star of the City access, Floor of Philosophy, Floor of Religion |
| Recommended Build | Floor of General Works |
| Key Equipment | Slash dice |
What to Do Here
- This is endgame. Best-in-slot gear and a perfected build are mandatory.
- See our boss guide for endgame fight strategies.
- The reward loop: clear content → upgrade → push harder content.
- Experiment with Floor of Art for variety once you've mastered the meta.
Exploration Tips
- Clear areas in order: Canard → Urban Myth → Urban Legend → Urban Plague → Urban Nightmare. Skipping areas means missing resources you'll need later.
- Check every corner: Hidden caches and secrets are often in non-obvious locations.
- Match your equipment: Some areas favor different equipment types.
- Read the walkthrough: Our walkthrough provides exact progression milestones for each area.
- Don't rush: Clearing an area fully gives more resources than speedrunning two areas.
More Library Of Ruina Guides
- Library Of Ruina Library Of Ruina Overview
- Library Of Ruina Best Builds
- Library Of Ruina Tier List
- Library Of Ruina Walkthrough
- Library Of Ruina Beginner's Guide
- Library Of Ruina Tips & Tricks
- Library Of Ruina Weapons Guide
- Library Of Ruina Combat Guide
- Library Of Ruina Boss Guide
- Library Of Ruina Crafting Guide
- Library Of Ruina Classes & Characters
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