The Horus Heresy: Betrayal at Calth

The Horus Heresy: Betrayal at Calth adapts the board game set during the infamous massacre that began the Horus Heresy. Players command Space Marines from the Ultramarines and Word Bearers legions in turn-based tactical combat through the underground arcologies of Calth. The claustrophobic tunnel fighting creates tense, close-quarters engagements quite different from typical 40K battles.

The tactical combat uses action points for movement and attacks, with line of sight and cover playing crucial roles in the confined spaces. Each Space Marine can be equipped with different weapons, allowing squad customization for specific missions. The hex-based movement and attack system creates clear tactical decisions while maintaining the fog of war that characterized the desperate fighting on Calth.

The campaign follows both loyalist and traitor perspectives, revealing the Calth atrocity from multiple angles. Mission variety includes assault, defense, and rescue scenarios, each requiring different tactical approaches. The narrative effectively conveys the shock and horror of Space Marines fighting their former brothers, a tragedy that would consume the galaxy.

VR support provides an optional immersive perspective on the tactical action, though the game works equally well in standard view. The visual design captures the pre-Heresy aesthetic of the legions, with detailed armor designs and environmental storytelling. Betrayal at Calth offers both an excellent tactical game and a compelling entry point into Horus Heresy lore.