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.
Your choice of equipment defines your damage output and playstyle. This guide ranks every major option, explains what makes each one strong, and tells you which builds they pair best with.
Equipment Rankings
| Equipment | Tier | Best For | Notes |
|---|---|---|---|
| Slash dice | S | Bleed decks, and any guest whose Key Page reads Weak at 1.5x or Fatal at 2x in the Slash column. | One of the three offensive damage types, and the one most Bleed pages are attached to. |
| Pierce dice | A | Guests who are Endured at 0.5x against Slash but Normal or worse against Pierce. | The second offensive type, tracked on its own resistance row for both HP and stagger. |
| Blunt dice | A | Hands that stay full, and stagger-focused plans where the Blunt row is the weak one. | The third offensive type. |
| A Zwei Fixer's Page | B | Mid-game floors that need a durable body while the good Combat Pages are still being printed. | An Urban Legend rank Key Page, sitting in the same tier as A Stray Dog's Page and the Grade 8 Fixer pages. |
| A Grade 7 Fixer, Page 1 | B | Replacing default Assistant Librarian pages once Urban Legend receptions start dropping Books faster than you can burn them. | One rung above the Grade 8 Fixer pages, on the City's fixer scale where Grade 9 is the bottom and Grade 1 the top. |
S-Tier: Slash dice
One of the three offensive damage types, and the one most Bleed pages are attached to. Sharpened Blade at cost 2 rolls two Slash dice at 1 to 3 plus a Block die at 4 to 5, and raises Slash power by 2 for the scene on combat start.
| Attribute | Detail |
|---|---|
| Tier | S |
| Best For | Bleed decks, and any guest whose Key Page reads Weak at 1.5x or Fatal at 2x in the Slash column. |
| Key Mechanic | Clashes and speed dice |
| Recommended Build | Floor of General Works |
How to get it: Available from mid-game onward. See our walkthrough for the exact progression point.
Best builds using Slash dice: Pairs naturally with Floor of General Works thanks to how their stat scaling lines up.
A-Tier: Pierce dice
The second offensive type, tracked on its own resistance row for both HP and stagger. Pierce and Slash are mechanically identical rolls, so the entire decision is which column of the guest's Key Page is softer.
| Attribute | Detail |
|---|---|
| Tier | A |
| Best For | Guests who are Endured at 0.5x against Slash but Normal or worse against Pierce. |
| Key Mechanic | Light and page cost |
| Recommended Build | Floor of History |
How to get it: Accessible in the early-to-mid game. Check our maps guide for the location.
Best builds using Pierce dice: Pairs naturally with Floor of History thanks to how their stat scaling lines up.
A-Tier: Blunt dice
The third offensive type. Will Make Fine Silk at cost 2 pairs a Block die at 4 to 6 with two Blunt dice, adds Fascinating Fabric to your hand, and gains 1 Power for every page held.
| Attribute | Detail |
|---|---|
| Tier | A |
| Best For | Hands that stay full, and stagger-focused plans where the Blunt row is the weak one. |
| Key Mechanic | Stagger Resist and damage types |
| Recommended Build | Floor of Technological Sciences |
How to get it: Accessible in the early-to-mid game. Check our maps guide for the location.
Best builds using Blunt dice: Pairs naturally with Floor of Technological Sciences thanks to how their stat scaling lines up.
B-Tier: A Zwei Fixer's Page
An Urban Legend rank Key Page, sitting in the same tier as A Stray Dog's Page and the Grade 8 Fixer pages. Key Pages set HP, Stagger Resist, Speed, all three resistance columns and the passive slots, so this is the frame every deck is built on.
| Attribute | Detail |
|---|---|
| Tier | B |
| Best For | Mid-game floors that need a durable body while the good Combat Pages are still being printed. |
| Key Mechanic | Emotion Level |
| Recommended Build | Floor of Literature |
How to get it: Found in later areas. Our walkthrough covers when you can access this.
Best builds using A Zwei Fixer's Page: Pairs naturally with Floor of Literature thanks to how their stat scaling lines up.
B-Tier: A Grade 7 Fixer, Page 1
One rung above the Grade 8 Fixer pages, on the City's fixer scale where Grade 9 is the bottom and Grade 1 the top. It arrives in the same Urban Legend batch, so upgrading a whole floor happens in one pass rather than one librarian at a time.
| Attribute | Detail |
|---|---|
| Tier | B |
| Best For | Replacing default Assistant Librarian pages once Urban Legend receptions start dropping Books faster than you can burn them. |
| Key Mechanic | Books and Reception invitations |
| Recommended Build | Floor of Art |
How to get it: Found in later areas. Our walkthrough covers when you can access this.
Best builds using A Grade 7 Fixer, Page 1: Pairs naturally with Floor of Art thanks to how their stat scaling lines up.
Equipment Progression Path
The order you should acquire equipment as you progress:
- Starting gear → Enough to clear Canard
- Pierce dice → Your first real upgrade, available early
- Blunt dice → Mid-game upgrade with good scaling
- Slash dice → Best-in-slot, aim for this by late game
- Upgrade to max → The power spike from max upgrades is enormous
Equipment Tips
- Always upgrade your primary equipment before diversifying. One strong option beats three mediocre ones.
- Match your equipment to your build's stat priorities for maximum scaling.
- Open the guest's Key Page before you build. The Slash, Pierce and Blunt columns run Ineffective 0.25x, Endured 0.5x, Normal 1x, Weak 1.5x and Fatal 2x, and the stagger table is separate from the HP table, so a fight can be won on stagger with damage types that barely scratch health.
- Check our tier list for how equipment rankings affect overall build effectiveness.
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 Combat Guide
- Library Of Ruina Boss Guide
- Library Of Ruina Maps & Locations
- Library Of Ruina Crafting Guide
- Library Of Ruina Classes & Characters
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