The Puertas de piedra negra con emblemas sagrados first appear in Volume 2 as a set of seven heavy black stone doors carved with the sacred emblems of the seven orthodox churches, arranged in an asymmetrical pattern that reflects the architectural style of the Fourth Epoch. Across the series, these doors serve as both physical and symbolic thresholds, marking the transition between the mundane world and the hidden realms of the Beyonders. Their presence underscores the enduring influence of ancient religious and mystical traditions, hinting at deeper connections to the lost history of the Fourth Epoch and the ongoing struggle between orthodox faith and forbidden knowledge.

The Puertas de piedra negra con emblemas sagrados first appear in Volume 2 as a set of seven heavy black stone doors carved with the sacred emblems of the seven orthodox churches, arranged in an asymmetrical pattern that reflects the architectural style of the Fourth Epoch. Across the series, these doors serve as both physical and symbolic thresholds, marking the transition between the mundane world and the hidden realms of the Beyonders. Their presence underscores the enduring influence of ancient religious and mystical traditions, hinting at deeper connections to the lost history of the Fourth Epoch and the ongoing struggle between orthodox faith and forbidden knowledge.