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Steam app 1097430 · updated 10 Sep 2026, 20:32 UTC

Book of Yog Idle RPG

The Book of Yog is a 3D idle RPG game presented with a Cel-Shading art style. You can rally heroes, develop the kingdom and explore the secrets of a lost world. Dozens of heroes, hundreds of skills, thousands of loot for you to combine freely. Come to embark on a journey to build the strongest team!

History chartsJune 2026 to September 2026
Last 30 days−31Gain−4.1%% gain1,278Peak
Book of Yog Idle RPG Steam header artwork
元气工作室元气工作室
662playing now
90024-hour peak
4,163all-time peak
724average, last 30 days

Game information

Free to playUpdated 10 Sep 2026, 20:32 UTC
App ID
1097430
Product type
Game
Developer
元气工作室
Publisher
元气工作室
Release date
Jul 29, 2022
Release status
Released
Early Access
Platforms
Windows
Genres
Action, Adventure, Casual, Indie, Massively Multiplayer, RPG, Strategy, Free To Play
Game modes
Single-player, Multi-player, MMO
Controller support
Declared DRM
Achievements
Steam Deck
Metacritic

Features & support

Steam features

In-App PurchasesFamily Sharing

Controllers & input

Accessibility

Popular tags

About this gameFull description from Steam
*** For information about current state of the Early Access version, please refer to "From Game Developers" section in this page. *** Recruit heroes, build a team, and explore an idle ARPG with an in-depth strategic system! Step up to be the Commander of “Arkrance” Strike Force, recruit the unique heroes of “Black Guard” and form your own team, slay and push back the vicious monsters emanating from the "Black Tide", defend the teetering Arkrance Great Wall, and find out the truth behind these apocalyptic turn of events. Experience an interesting and relaxing idle RPG. There are heroes, skill tomes and loot that are waiting for you to mix and match into the strongest team with the most powerful heroes in order to overcome any obstacles that are thrown in your way. Main feature Idle system Experience an easier idle ARPG! You can progress even when you are offline. No need to waste time in meaningless battles. Facilitate the growth of your team, to enjoy the game at your own pace! Heroes Dozens of heroes are waiting for you to recruit (30 in early access), and more heroes are waiting to join the game. There are 6 unique classes waiting for you to choose: Warriors, Tanks, Rangers, Assassins, Mages and the Support class. Each class has its own unique and special class system and talent trees. If you like RPGs, this will be right up your alley! Strategy System Experience the rich in-game strategic system to maximize your potential, customize the items, skills, talents, characters freely to make your own perfect hero! Skill Combination Each hero has their own unique skill trees and talents, collect special skill tomes to customize your heroes' skill trees. Feel freely to collect, learn and combine. And create a most fun and powerful hero to improve the combat strategy and the fun of the game! Team Formation Assemble a team with 4 "Black Guards" to fight with you. Different team combinations can activate different unique and powerful synergistic effects. There will be paths to victory even if you decide to have a team of 4 tanks or 4 supports. The choice is up to you! RNG System Explore the wilderness, battlefields, and dungeons, and slay the monsters to get thousands of unique loot, all of which are randomly generated. Each battle can bring an unexpected reward and experience! Loot System It’s an idle game for a reason, play at your own pace. There’s no need to invest too much effort, nor is there need to P2W. Whether it is loot, skill tomes, skill materials or even heroes, they can be gained easily through normal gameplay. Sand-box System You can DIY your own lodgings with the sand-box construction system, enjoy a fun, relaxing and personal game experience! (Under development, not released yet) And more game contents will be published with our continuously update, please stay tuned!
Content & age ratingsSteam content notice · 1 regional rating

Content notice

Some female characters in the game are slightly exposed

Regional ratings

DEJUSl
System requirementsMinimum and recommended hardware

Minimum

Minimum: OS *: Windows 7, Windows 8, Windows 10 Processor: Intel Core-i3 or faster processor Memory: 4 GB RAM Graphics: any type DirectX: Version 9.0 Storage: 400 MB available space Sound Card: any type

Recommended

Recommended: OS *: Windows 7, Windows 8, Windows 10 Processor: Intel Core-i5 or faster processor Memory: 8 GB RAM Graphics: any type DirectX: Version 9.0 Storage: 1 GB available space Sound Card: any type
Supported languages2 languages
LanguageFull audio
English
Simplified Chinese

A blank audio cell means full audio was not marked in the returned language list.

Screenshots & trailersScreenshots and trailers

Trailers

AchievementsTotal count and selected achievements