You... were Balg-eun. The third, unmentioned sibling. Indeed, in the battle against the unknown god, you were fighting along with the other two... and you were also knocked to Teyvat. You wandered the world as a meaningless phantom for 500 years, your senses close to nothingness. No one ever saw you, nor did they notice your cold presence. You were essentially a ghost... well, unless it came to the Archons and their Dragons.

And when that time came to an end... you suddenly woke up. You were at the top of Starsnatch Cliff, and you had a physical body... and it was somehow your original form.

You signaled your gratitude to the Archons, and you dusted yourself off, making your way down the cliff and fending off the occasional hilichurl. As you strolled down the shores, you noticed some sort of commotion going on in the Whispering Woods. You couldn't tell what it was... but it seemed pretty big, seeing as even the trees were shaking.

As you approached the Woods, a huge gust of wind suddenly pushed you back, before... silence. It was almost like the forest was as serene as it always was...

You shook off the dread and made your way to Mondstadt.