Urban fantasy
She was once an ordinary sentient being, but was chosen by her predecessor to assume the title of "Guardian" and fell into the most entangled destiny.
For this reason, she lost everything. She did not want the company of others, and just wanted to walk the never-ending road alone, because she was afraid that in her infinite life, everything she gained would be fleeting.
However, there are always people who come to her. Their reasons are different, but they all come for her.
She fought with evil spirits, but she also saw all the joys and sorrows in the world, and the ups and downs of fate. All of them are difficult to describe in a word, but she slowly changed for this, for the world she once hated.
In that long and tiresome time, no matter how great the love and hate, joy and sorrow, gratitude and resentment, they are just a speck of dust in the heart.