The Shadow of Yserbius
Platform: DOS
A lone adventurer must stop the ancient shadow demon Yserbius from consuming the world, navigating a vast online realm filled with danger, mystery, and other players in a race against time.
The Shadow of Yserbius is a 1991 graphical MUD (Multi-User Dungeon) developed by Joe Ybarra of Ybarra Productions and published by Sierra On-Line. It was the first of three graphical MUDs designed for online communities and was followed by two successors. The game and its follow-ups remained online until 1996, when America Online acquired the rights from AT&T for an undisclosed price. However, AOL soon discontinued The Shadow of Yserbius, likely due to its competition with the company's own online role-playing game, Neverwinter Nights.
Tell us your platforms and PC — every game page will show what you can play right now.
Set up your profile →Community tags
Be the first to tag this page — tags appear right away. Try a theme, capability, or subject (e.g. WWII, heist, slow burn, time travel, A24).
Ratings & reviews
Where to watch
Not currently streaming on any platform we track.
Gallery
Add imageNo community images for The Shadow of Yserbius yet
Add a screenshot, a storyboard, or concept art — every image gets its own page where members can discuss it.
Media & Uploads
Screenshots, concept art, manuals, and community reference material for this game.
Did you or a loved one work on The Shadow of Yserbius?
Every stage matters — pitches and treatments from concept, prototypes and vertical slices from pre-production, internal screenshots, crunch memories, and design-pivots from production, QA bug stories and certification notes from post, and marketing kits, launch parties, and platform-storefront ephemera from distribution. Concept art, sketches, design docs, a bug that became a feature — please share what other fans would find interesting, so it's not lost to time.
We particularly welcome contributions from designers, writers, developers, producers, QA, community managers, publishers, marketing teams, their families, and anyone who was there at any stage.
Sign in to contribute screenshots, design docs, concept art, or behind-the-scenes stories.
Be the first to share something on The Shadow of Yserbius.
Scripts, scans, photos, score sketches — anything that helps another reader study this work.
Physical releases
No physical releases yet for The Shadow of Yserbius. Sign in to submit one.
Trailers
No trailers logged for The Shadow of Yserbius yet — add the first one below.
Spot a trailer we’re missing?
Add a trailer from any film, show, or game.
Memorable quotes
Browse all →No quotes logged for The Shadow of Yserbius yet — add the first memorable line below.
Got a quote we’re missing?
Submit a line from any film, show, or game.
The conversation
Loading the conversation…
Comments (0)
on The Shadow of YserbiusNo comments yet. Be the first to share what you think.
No discussion yet
Start the discussion on The Shadow of Yserbius.
You’ll be the first. We’ll spin up a forum tied to this page, your first post will live there, and other readers can join in.
Or — start a club
Build a member-run space around The Shadow of Yserbius.
Banner, dedicated feed, events, members + admins. You’re the founder. Two clicks to live.
Edit history
Loading edit history…