
- BGG rank
- BGG #7,089
- BGG rating
- 8.4
DreadBall (Second Edition)
- 2 players
- 45–90 min
- Complexity 2.7/5
- 2018

2015
Rules assistance for The Horus Heresy: Betrayal at Calth
Plain-language explanations of turns, card effects and disputed situations, with official source references and saved question history.
For 2 players

What would you like to know?
Answers come from the official rulebook, with the page to check.
The Horus Heresy: Betrayal at Calth is a board game released in 2015 for 2 players and 30–60 minutes per game. It was designed by James M. Hewitt and its main mechanics are Variable Player Powers and Dice Rolling.
From the official description: "The Horus Heresy: Betrayal At Calth is a fantastic standalone boxed game of claustrophobic tunnel combat, set during the Word Bearers’ invasion of the Ultramarine world of Calth. Emphasising fast-paced squad-based combat during six exciting missions, it allows players to choose their side and command a force of beautifully detailed Citadel miniatures in a brutal war for survival, during one of the iconic battles of the Horus Heresy."
The Horus Heresy: Betrayal at Calth supports 2 players according to the catalogue. This is the publisher’s listed player count, so the game is designed for exactly that number of participants. Variants for other group sizes, if any, are described in the rulebook of your edition, so check it before setting up a different configuration.
The listed playing time for The Horus Heresy: Betrayal at Calth is 30–60 minutes. This is the publisher’s estimate for a full game. The actual duration depends on the group, the player count and familiarity with the rules: first sessions usually run longer, while experienced groups often finish faster. Setup and teaching time are not included in this estimate.
The Horus Heresy: Betrayal at Calth has a complexity rating of 2.5 out of 5 from BoardGameGeek players, which makes it a medium-light game. The rating reflects how much rules knowledge, planning and decision-making a typical game demands. Expect a longer first teach for heavier games, and use a preparation guide before game night.
The Horus Heresy: Betrayal at Calth belongs to these categories: Wargame, Miniatures, and Science Fiction. Its main mechanics are Variable Player Powers and Dice Rolling. Categories describe the theme and setting of a game, while mechanics describe what players actually do on their turns. Each mechanic links to a catalogue hub with similar games, which helps when you want something comparable.
The credited designers of The Horus Heresy: Betrayal at Calth are: James M. Hewitt. These credits come from the published game data and name the people responsible for the game’s design, not its illustrators or publishers. Designer pages on MeepleRules collect other titles by the same designers, which helps when you enjoy a game and want to find similar ones.
The catalogue lists The Horus Heresy: Betrayal at Calth as a base game. It can be played on its own with the components in the box and does not require any other title. Expansions, if any exist, add new content or rules on top of it and are listed separately in the catalogue with a link back to this base game.