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.
Choosing the right build shapes your entire experience. This guide breaks down every option: what they're good at, what they struggle with, and which one matches your playstyle. For optimized builds with full gear sets, see our builds guide.
Quick Comparison
| Build | Tier | Playstyle | Best Equipment | Beginner Friendly? |
|---|---|---|---|---|
| Floor of General Works | A | Balanced | Slash dice | Yes |
| Floor of History | A | Balanced | Pierce dice | Yes |
| Floor of Technological Sciences | A | Balanced | Blunt dice | Yes |
| Floor of Literature | A | Balanced | A Zwei Fixer's Page | Yes |
| Floor of Art | A | Balanced | A Grade 7 Fixer, Page 1 | Yes |
New player? Start with Floor of History. See our beginner's guide for why.
Floor of General Works
Floor of General Works is a strong option in Library Of Ruina.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Balanced approach |
| Best Equipment | Slash dice |
| Stat Priority | Balanced stats |
| Core Gear | Best available |
| Key Mechanic | Clashes and speed dice |
Strengths
- Highest overall performance across all content types
- Solid all-around choice
- Pairs well with Slash dice
Weaknesses
- Popular choice, competition for resources
- Needs specific gear to reach full potential
Recommended Progression
- Start in Canard to learn Floor of General Works-specific mechanics
- Focus on Clashes and speed dice. It's this build's primary system
- Prioritize Slash dice as your first major upgrade
- See our full Floor of General Works build guide for the optimal gear progression
Floor of History
Floor of History is a strong option in Library Of Ruina.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Balanced approach |
| Best Equipment | Pierce dice |
| Stat Priority | Balanced stats |
| Core Gear | Best available |
| Key Mechanic | Light and page cost |
Strengths
- Most versatile, adapts to any situation
- Solid all-around choice
- Pairs well with Pierce dice
Weaknesses
- Lower peak damage than S-tier options
- Needs specific gear to reach full potential
Recommended Progression
- Start in Canard to learn Floor of History-specific mechanics
- Focus on Light and page cost. It's this build's primary system
- Prioritize Pierce dice as your first major upgrade
- See our full Floor of History build guide for the optimal gear progression
Floor of Technological Sciences
Floor of Technological Sciences is a strong option in Library Of Ruina.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Balanced approach |
| Best Equipment | Blunt dice |
| Stat Priority | Balanced stats |
| Core Gear | Best available |
| Key Mechanic | Stagger Resist and damage types |
Strengths
- Best survivability for learning hard content
- Solid all-around choice
- Pairs well with Blunt dice
Weaknesses
- Slower progression speed
- Needs specific gear to reach full potential
Recommended Progression
- Start in Canard to learn Floor of Technological Sciences-specific mechanics
- Focus on Stagger Resist and damage types. It's this build's primary system
- Prioritize Blunt dice as your first major upgrade
- See our full Floor of Technological Sciences build guide for the optimal gear progression
Floor of Literature
Floor of Literature is a strong option in Library Of Ruina.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Balanced approach |
| Best Equipment | A Zwei Fixer's Page |
| Stat Priority | Balanced stats |
| Core Gear | Best available |
| Key Mechanic | Emotion Level |
Strengths
- Excellent in group and cooperative content
- Solid all-around choice
- Pairs well with A Zwei Fixer's Page
Weaknesses
- Less effective solo
- Requires deep game knowledge to use effectively
Recommended Progression
- Start in Canard to learn Floor of Literature-specific mechanics
- Focus on Emotion Level. It's this build's primary system
- Prioritize A Zwei Fixer's Page as your first major upgrade
- See our full Floor of Literature build guide for the optimal gear progression
Floor of Art
Floor of Art is a strong option in Library Of Ruina.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Balanced approach |
| Best Equipment | A Grade 7 Fixer, Page 1 |
| Stat Priority | Balanced stats |
| Core Gear | Best available |
| Key Mechanic | Books and Reception invitations |
Strengths
- Highest skill ceiling with unique mechanics
- Solid all-around choice
- Pairs well with A Grade 7 Fixer, Page 1
Weaknesses
- Steep learning curve, punishing mistakes
- Requires deep game knowledge to use effectively
Recommended Progression
- Start in Canard to learn Floor of Art-specific mechanics
- Focus on Books and Reception invitations. It's this build's primary system
- Prioritize A Grade 7 Fixer, Page 1 as your first major upgrade
- See our full Floor of Art build guide for the optimal gear progression
Which Build Should You Pick?
For Beginners
Floor of History is the clear winner. It's forgiving, teaches core mechanics, and remains competitive into endgame. Follow our beginner's guide for the best first-session experience.
For Maximum Performance
Floor of General Works is the top pick once you understand the game's mechanics. Pair it with Slash dice for the strongest overall setup.
For a Challenge
Floor of Art offers the highest skill ceiling. It's punishing when misplayed but incredibly rewarding when mastered. Only recommended after you've completed the game with another build.
For Group Play
Floor of Literature shines in cooperative content with utility and team support capabilities.
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 Maps & Locations
- Library Of Ruina Crafting Guide
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- Slay the Spire Classes Guide: card-game game with similar mechanics
- Balatro Classes Guide: card-game game with similar mechanics
- Sultan's Game Classes Guide: card-game game with similar mechanics
