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Library of Ruina is a deck-building turn-based RPG officially released for PC and Xbox One on August 10th, 2021. It would later become available on PS4, and Nintendo Switch. It was developed and published by South Korean studio Project Moon and is the direct sequel of their previous game Lobotomy Corporation. Project Moon's third installment Limbus Company takes place sometime after the events of Library of Ruina

The side story light novel Distortion Detective takes place during the events of Library of Ruina. The other light novel Leviathan was illustrated as a comic. It takes place between Library of Ruina's true ending and the start of Limbus Company.

Reception
The Library is split up into ten floors, each floor automatically starts with a patron librarian upon unlocking a floor. As the player progresses through the game's storyline they will gain access to more floors. On the top left side of the main menu, players can open a side tab where they can send an invitation, burn books, and read key page stories.

Invitations are how guests are brought to the Library for battles known as receptions. In the story, anyone who receives one is destined to come. Before the start of each reception, players are brought to a screen that shows their librarians and the guests. Selecting any character will display their stats, weaknesses, passive skills, and combat pages. Before starting a reception players can change equipment and combat pages, changes cannot be made after a reception has begun. Librarians will keep whatever damage they take until the reception is over. Library of Ruina's story is primarily shown in a visual novel format. Once a reception starts, the player will get a cutscene about the guests and their motivations for entering the Library. After the reception ends they will get another one of Roland and Angela holding a discussion relating to the guests. Some cutscenes are unrelated to receptions and focus on a specific character within the Library.

Key and Combat pages
After clearing a battle, the player will receive books of the defeated enemies. The two types of books that can drop are named after a character or their group. Burning these books randomly gives the player key pages and combat pages. Pages are color-coded based on rarity and how many of the same page a player can have. Key pages will have a symbol relating to the group or individual it is from, while combat pages usually have an image of one or more characters from where the burned book originated. Key pages are equipment that can be assigned to the player's librarians, equipping one will give them the stats of the key page's character. Each page gives different stats, damage resistances, and passives. Combat pages can be used to attack, defend, or both. Some combat pages are unique to a specific character and their key page.

The three types of damage in Library of Ruina are slash, pierce, and blunt damage, they affect both a character's health and stagger. If a character's stagger reaches zero they will not be able to move the next turn, they will also receive fatal damage from all three attack types regardless of resistance. Characters will have different resistances and weaknesses based on their equipment. Their health and stagger may not share the same strengths or vulnerabilities.

Combat
In battle, every character has dice and dots of 'light' above them, by clicking the symbol on the top middle of the screen, each dice will randomly roll a number or value. The amount determines a character's 'speed', speed determines which character moves first. By hovering over an enemy's dice, the player will see an arrow pointing to one of their librarian's dice with the combat page the enemy intends to use. Players can have a librarian redirect an attack meant for one of their other librarians. Combat pages vary and have different light costs that the player needs to carefully manage, most pages require a minimum of one light. If the librarian runs out of light or does not have a zero cost page they will be unable to act. Light points are regained once per turn or in some cases refunded by winning certain clashes or raising the emotion level of that battle. Pages will have at least one attack, defense, or evasion action. These three actions follow the following rules: attack an enemy, defend to reduce or negate damage, and evade to dodge an attack entirely.

When engaging an unstaggered opponent, characters will enter a clash where their page actions interact with each other. Two dice will roll and the highest value will act, in the event both dice roll the same value actions will be canceled out. Winning with an attack or shield action will also deal stagger damage to the opponent. Failing a dodge will result in the character getting hit.

Abnormality battles
To progress through the story players will have to fight in abnormality battles, there are three to four per floor. Many of the abnormalities present in-game originate from Lobotomy Corporation. Abnormalities on each floor share a common theme with each other or the floor's name, for example, the abnormalities of the Floor of Philosophy are a trio of birds that can combine into one being. Every abnormality battle has a certain gimmick or mechanic the player must figure out to defeat them. players are limited to the floor's librarians. There is no cost to enter battle. The player does not lose any books if they fail, these battles can be retried an unlimited amount of times.

After completing an abnormality battle, the floor realization will rise one level and a new librarian will be unlocked for the floor. Including the head librarian, five characters in total will be available per floor. Players can change a librarian's name, appearance, and combat dialog outside of battle.

Emotion level is a mechanic that raises whenever a character deals or receives damage, naturally their “emotions” rise. After a certain point, the group will gain an emotional level-up. Players choose one abnormality page to apply to a librarian. Abnormality pages come in two colors, green and red. Green pages have purely beneficial effects but give small advantages. Red pages are more powerful however they also have negative drawbacks. When the emotion level rises again, another abnormality page can be picked. The emotion level can rise up to five times per battle.

Floor realizations
After the player has gone through all of the abnormality battles on a floor. They will have the opportunity to complete a floor realization. During a floor realization, the player will part in a multi-segmented battle against Angela or Roland when they have an emotional meltdown. In each phase, Angela or Roland will have the abilities and appearances of one of the floor's abnormalities. The final phase will have players fighting a new abnormality form that wasn't a part of the previous realizations. The floor realization for the Floor of General Works can only be entered if all of the other floors have been completed and is required for the true ending.

Setting
Library of Ruina takes place in a dystopian world known as The City which is made of twenty-six districts. A nest and the backstreets further separate each district. Nests are run by a Wing, mega-corporations that harness powerful technologies known as singularities. The backstreets are crime-riddled areas controlled by syndicates. Throughout The City, there are many offices run by fixers, mercenaries regulated by the government. Fixers are defined by grades with the weakest being grade 9 and the strongest grade 1, in special cases fixers who are a cut above the rest gain the rank of a color fixer along with an epithet.

After the events of Lobotomy Corporation, Angela creates the Library out of the light produced by Lobotomy Corporation's seed of light. Before she opens the Library, Roland a washed-up fixer appears in it and is forcefully recruited by Angela to be her guide to the City. Angela wishes to find the one true book that contains the answers she desires and turns her human. She sends out Invitations and has Roland and her other librarians fight the guests. If the guests win, they are allowed to take a book; if they lose, they become a book themselves. Canonically the Library never loses a battle.

Characters
Aside from the Floor of General Works, all patron librarians are returning characters from Lobotomy Corporation. During the events of Lobotomy Corporation Angela was an AI acting as the manager's assistant. The Patron Librarians were known as Sephirah and each one was in charge of one of Lobotomy Corporation's departments. The previous Sephirah and their floors are modeled after the Kabbalistic Tree of Life, the colors are based on the Queen Scale colors.
 * Angela - The Library's Director.


 * Roland - Patron Librarian for the Floor of General Works. Accessible at the start of the game. Although being the first unlocked floor, it has the final battle for floor realizations and Impuritas Civitatis.
 * Malkuth - Patron Librarian for the Floor of History. Accessible after finishing part 3 of Yun's Office.
 * Yesod - Patron Librarian for the Floor of Technological Science. Accessible after finishing the reception of the Hook Office.
 * Hod - Patron Librarian for the Floor of Literature. Accessible after finishing part 1 of the Streetlight Office.
 * Netzach - Patron Librarian for the Floor of Art. Accessible after gaining the rank of Urban Legend.
 * Tiphereth - Patron Librarian for the Floor of Natural Sciences. Accessible after completing the realizations on the previous floors.
 * Gebura - Patron Librarian for the Floor of Language. Accessible after finishing the reception for the Shi Association.
 * Chesed - Patron Librarian for the Floor of Social Sciences. Accessible after opening the Floor of Languages and finishing the reception of Puppets.
 * Binah - Patron Librarian for the Floor of Philosophy. Accessible after gaining the rank Star of the City.
 * Hokma - Patron Librarian for the Floor of Religion. Accessible after finishing one reception in Star of the City.

Story
In Urban Legend the storyline splits into two paths after the Zwei Association. Urban Plague, Urban Nightmare, and Star of the City have four paths. They are divided based on factions and plot points. There is no required order, all paths must be completed to progress to the next rank. The story chapters are broken up into the following scenes: Canard, Urban Myth, Urban Legend, Urban Plague, Urban Nightmare, Star of the City, Impuritas Civitatis, and Epilogue.

Music
Library of Ruina's soundtrack was created by two music studios, South Korean game sound studio Studio EIM and Asian indie band Mili. Studio EIM composed music for the general guest battles including the floor, abnormality, and realization themes. The background music changes throughout a battle rising with the emotion level. Mili made an album with seven songs that were tailored to specific characters. The eighth song in the album Salt, Pepper, Birds, and the Thought Police is not a part of the official soundtrack. One of the songs String Theocracy is Library of Ruina's opening theme song.

Releases
Library of Ruina was originally available on PC through Steam and Xbox One. It had an early access

On March 14th, 2024, the Arc System Works Asian branch uploaded a Twitter post announcing the release of Library of Ruina to the PS4 and Nintendo Switch on April 25th, 2024 which was later retweeted by the official Project Moon Twitter account.

Reception
Xbox Hub writer Richard Barker describes the game as having an interesting storyline but terrible in introducing and explaining battle mechanics.