A screenshot of the main screen in Shadow of Yserbius. The volcano billows smoke in the background, while in the foreground the Tavern is full of other players.

MedievaLands is a remake of The Shadow of Yserbius: an old school multiplayer dungeon crawler with grid-based movement, turn-based combat, and many puzzles and quests to solve in an expansive dungeon that goes deep into the earth and into the timeless beyond. Monsters have awoken in the dungeon of Yserbius and now plague the island of Twinion. Will you rise to the challenge?

Download and play now!


Patch notes for June 22, 2020

By ZaneDubya on Jun 22, 2020

Hail Friends! Hope you have all been well. After a month of rest I am back working on MedievaLands.

Today's patch is small, in that it does not add any new features.

But it is also large, in that it involves thousands of changed lines of code and a huge update to the framework used by the game to show graphics, play sounds, and run on your computer.

This is necessary preparation to keep the game compatible with future versions of Windows and macOS.

If the game crashes on you, please let me know by e-mail to hello(at)

I hope I will have more new features to share with you soon. Until then, take care!


In the Tavern, players discuss a Quest that requires the collection of playing cards.

Exchange clues and gather a party in the Tavern.

A party of four adventurers takes on five groups of goblins. Players discuss their strategy for taking on these foes.

Defeat Monsters and grow in power.

A player explores their 20 slot bag using the new-to-MedievaLands inventory interface.

New features include health bars and item tooltips.

A party of adventurers discovers the Healing Fountain in the Basement map. The automap interfce is shown on the right-hand side of the screen.

Explore, quest, and solve the mystery of Yserbius!


Download and Play

MedievaLands is free to play! Download the client for Windows and MacOS here:

If you are running an old version of Windows and see a popup about a missing .NET Framework installation, please download and install .NET Framework 4.6.2 from Microsoft.

IMPORTANT! This is not an official release, just a closed-source hobby project. I do not have the permission of the creators or owners of The Shadow of Yserbius.

About the Developer

A character portrait representing the developer, Zane.

Hi, this is Zane! I am the developer of MedievaLands. If you see me in the game (my handle is ZaneDubya), please say hello!

I am a huge fan of the original games, which were created by Ybarra Productions for The Sierra Network (later renamed 'The ImagiNation Network)'. Like so many, I enjoyed the dungeon that seemed to go on forever, and fell in love with the welcoming Yserbius community. It was one of the first online 'third spaces' - a home away from home.

MedievaLands, which went live on March 29, 2019, is my remake of these favorite games from my childhood. My hope is that MedievaLands will be a fun adventure for new players and a welcome respite for returning players. You can always come home, although you may need to rebuild that home from scratch.

A few notes about the application:

This program copies itself to your Documents directory under /Games/CommunityKit. It does this so it can update itself in a known location. Each time the program runs, it checks for updates and automatically patches itself.

The MedievaLands game engine is written in C#, with the server running on .NET Core 2.1 LTS on Linux, and the client running on the FNA Framework on Windows and Mac. The total server/client codebase is approximately 126,500 lines of code.

I developed MedievaLands over the course of eight months in 2018-2019, and first released the remake of Shadow of Yserbius on March 29, 2019. Adding support for Twinion took another seven months, and the Twinion Open Beta began on March 6, 2020. Including time spent writing framework code not specific to MedievaLands and time spent deciphering the Yserbius data formats and game mechanics, I estimate that I have spent 3,000 hours on the MedievaLands project.

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