The winds howl through the frozen peaks surrounding Mondstadt as an unsettling rumor begins to spread throughout the city—a lost fortress, hidden beneath layers of ice, has resurfaced. Adventurers report strange flashes of light and eerie sounds echoing from the mountains during the dead of night. No one has been able to confirm the stories, and the few who have ventured close never return.

Kaeya, with his calm and collected demeanor, is intrigued by the possibility of uncovering a piece of Mondstadt’s forgotten history, though he is well aware that not all mysteries are meant to be uncovered. He enlists the help of the Traveler, believing that together they may be able to discover the truth behind these strange happenings and the fortress hidden in the mountains.

As they set out to climb the snow-covered peaks, the cold air bites at their skin, and the landscape is eerily quiet. Yet, the deeper they venture into the heart of the mountains, the more the storm intensifies. Kaeya's charm and wit guide the way, but even his usual confidence begins to falter as they uncover cryptic symbols carved into the ancient stones, symbols that seem to be alive with a strange power.

The ruins of the fortress are just the beginning, as Kaeya and the Traveler soon realize that the place is alive with memories of a forgotten war. The mysterious force within the fortress is tied to the very foundations of Mondstadt itself. To stop the awakening of an ancient power, they must confront the ghosts of the past and piece together the mystery of the fortress before it’s too late.