Chaos in the Old World: The Horned Rat Expansion

Edge Entertainment, Fantasy Flight Games, Galakta · Board game · 2011
— Ludopedia 8.0 BGG 3–5 · best 5 90 min Weight 3.3/5
Buy · from US$ 189.95
— rating Ludopedia
8.0 rating BGG
Our Verdict

If you love a blend of strategy, horror, and the Warhammer world, this expansion will put you at the front line.

Highlights
  • Rogue rat horde control
  • Area influence mechanics
  • Unique player powers
Keep in mind
  • Only for those familiar with the base game
  • More complexity with 5 players
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About the game

What you do in a play session

Imagine a sprawling network of dark tunnels, caves, and underground roads, all teeming with verminous Skaven ready to rise from the warrens. That’s the vibe the *Chaos in the Old World: The Horned Rat* expansion brings to your base game. Released in 2011, the Warhammer Fantasy universe delivers the Skaven—giant, cunning, and ravenous rats—and now you can play as the Horned Rat himself, commanding a legion of rat‑infested followers. The core mechanics stay the same: Action Points give you a limited pool to spend on moves, attacks, or upgrades. The expansion ups the player count from 4 to 5 and introduces new cards, alternative upgrades, and game variants, even for seasoned players. You’ll fight for area majority, spreading your horde across the board while rolling dice to decide the outcome of brutal skirmishes. Variable Player Powers add strategic depth: the Horned Rat spreads masses for points, while the Ruinous Powers try to stop or co‑opt the rats. If you love strategy, interaction, a dash of horror, and a Warhammer setting, this expansion is a must‑have. Get ready to lead swarms, manipulate the battlefield, and unleash chaos across the Old World!

Expansion for

Published additional content

1 items

Rules videos

Learn by watching before you open the box

1 videos

Best player count

BGG community vote

3–5 players
3 OK
4 REC
5 BEST

Where to Buy

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Game details

Mechanics, categories, families and credits

Families

Animals: Rats Players: Expansions Changing Player Count Setting: Warhammer Fantasy Board Games
Publisher Edge Entertainment, Fantasy Flight Games, Galakta, Heidelberger Spieleverlag
Designer Eric M. Lang, James Hata, Jay Little
Artist Brian Schomburg, Michael Silsby, WiL Springer

Community

Data from BoardGameGeek

6,437owners
636wishlist
261want to play

Frequently Asked Questions

Quick answers before you buy

7 questions
How long does a game last with the expansion?
Games typically run between 90 and 120 minutes, depending on player count and experience.
Can I play with 3 players using this expansion?
No, the expansion is designed for 4 to 5 players; playing with 3 would require rule adjustments.
What new cards come with the expansion?
New upgrade cards, alternative Chaos cards, and advanced level cards for veteran players.
What is the complexity level?
Medium to high – the expansion adds extra rules and more strategic options.
Who will enjoy this expansion?
Fans of Warhammer Fantasy, area‑control mechanics, horror themes, and strategic play.
Do I need the base game to play?
Yes, the expansion requires the base game Chaos in the Old World.
Does the expansion change the player count?
Yes, it allows play with 5 players, adding more dynamics and competition.