From Game Developers

We are a small indie development team and our aim is to make a content-filled idle character development game.

We obviously can't get to a fully polished and perfect game in such a short period of time, so we have made the conscious decision to keep it free, our hopes being that the players will participate in the updates and improvement of our content, and we do hope for your support and understanding.

We are aiming to maintain the rhythm of updating every 2-3 weeks from the onset of our early access, and we hope to steadily add content and support the game for 3 years or even longer. We hope that a steady content update as well as a continuous dialogue with our players will convince you that we are in this for the long haul. Everyone are welcomed to join our communication, your precious suggestion will help us to make this game better!

Follow Us!

Welcome to follow the Book of Yog on:

• Discord:

• YouTube:

• X (Twitter):

게임 정보

*** 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!