Apostolia's Gate

Apostolia’s Gate, encircling the northern pole of Thalas, is one of the greatest and most enduring mysteries of the Sisterworlds. The colossal walls—etched with ancient markings, lined with glowing crystals, and interspersed with towering sealed gates—have stood for as long as history remembers. No record, scripture, or myth tells of who built them or for what purpose. For centuries, the people of Thalas believed these fortifications marked the very edge of the world, a divine boundary separating the mortal realm from whatever lay beyond. But with the revelation that Thalas is a sphere, scholars and explorers began to see the structure not as a border, but as a prison—a perfect circle of walls surrounding something vast and unknown at its heart. The crystals embedded in the gates hum softly at night, and travelers claim to hear faint echoes from within, as though something ancient stirs behind the stone.

The nation of Apostolia’s Gate itself, grew from the obsession to uncover its secret. Founded by treasure hunters, explorers, and archaeologists who anchored their ships around the perimeter, the floating city now clings like coral to the outer walls of the structure. The labyrinth of docks, bridges, and vessels has become a thriving hub of commerce and curiosity, where trade flows by day and exploration by night. Scholars labor ceaselessly to decipher the runes that cover the gates, while divers descend into the depths searching for hidden mechanisms or buried chambers. Despite countless efforts, none have managed to open a single door, nor pierce the mystery of what lies within. Yet life thrives here—markets bustle, ships come and go, and the people of Apostolia live under the constant presence of the silent, glowing walls. To them, the gates are both home and haunting—guardians of an ancient secret that may hold salvation, or doom, for all of Thalas.