While there isn't one "official" editor exclusive to the Xianxia mod, several established tools work with its save files:
Li Wei grinned, tasting copper. In his first life, he had wanted to leave a legacy but couldn't. Now, the editor would let him do the opposite—un-create everything. He started deleting. corruption of champions xianxia save editor
A lightweight tool for opening .sol files directly. While there isn't one "official" editor exclusive to