Bloodstained Front

I seem to have forgotten a lot after my rebirth, but the important memories are still there. Have you seen that eternal blood-colored canopy hanging across the sky? That is connected to a world called the Bloodstained Front, where he has buried many secrets that are not made public. There seems to be something important in the north that leaves them and us with no choice but to go on the Northern Expedition. There are many secrets hidden in the sky, ocean and even the stars. I only vaguely remember so many, and more... I seem to have forgotten