I'm Not An Immortal (我不成仙) by Shi Jing (时镜): Preface

Synopsis:

Even if you become an immortal, you still cannot escape this single sword strike of mine.
With sword in hand, she roamed the world freely, and countless immortals died beneath her blade. Thus, people gave her the name “Immortals’ Sorrow” (Xian Jian Chou).
“Immortals’ Sorrow, Immortals’ Sorrow — even immortals feel despair upon seeing her.”

Later, they came to call her the “Fairy of Sorrow.”

Rumor has it that she once had a husband who killed his own wife to attain the Dao.

“Immortals’ Sorrow” is a woman — the only cultivator among the vast Three Thousand Realms who does not wish to become immortal.