Io Mountain Fortress

Io Mountain Fortress appears in Red Rising Saga.

Io Mountain Fortress debuts in Iron Gold as a formidable Gold stronghold perched amid the sulfurous peaks of Jupiter's moon Io, serving as a critical bastion for the remnants of the Society's forces. Its strategic value lies in controlling vital resources and launch points for counteroffensives against the rising Republic, drawing Darrow and his allies into a high-stakes confrontation that tests the limits of their post-Rebellion alliances. As the series progresses, the fortress evolves from a symbol of entrenched Gold power into a contested ruin whose fall accelerates the fragmentation of old empires and the rise of new threats across the solar system.