Estructura Subterránea de la Cuarta Época appears in Lord of Mysteries.

The Estructura Subterránea de la Cuarta Época is a vast, labyrinthine underground complex from the Fourth Epoch that serves as both a historical relic and a living threat across the series. Initially introduced as a mysterious ruin, it gradually reveals itself as a nexus of sealed horrors, ancient rituals, and lingering Beyonder influences. Its corridors shift between eras, trapping explorers in time-loops and forcing confrontations with the Fourth Epoch’s forgotten sins.

Estructura Subterránea de la Cuarta Época appears in Lord of Mysteries.

The Estructura Subterránea de la Cuarta Época is a vast, labyrinthine underground complex from the Fourth Epoch that serves as both a historical relic and a living threat across the series. Initially introduced as a mysterious ruin, it gradually reveals itself as a nexus of sealed horrors, ancient rituals, and lingering Beyonder influences. Its corridors shift between eras, trapping explorers in time-loops and forcing confrontations with the Fourth Epoch’s forgotten sins.