Reincarnated as the Villainess, I Must Extend My Life at Once

One-line summary:

I thought I was stuck in a miserable household-intrigue story. Instead, I used physical exorcisms and hostile takeovers to drive the court's villains mad, and even dragged a god who cultivated the Path of Ruthlessness down into the mortal world.

Synopsis:

"Your Highness, Miss Shen has gone to wreck the place on West Street again!"

"Let her. She won't die."

"Your Highness, Miss Shen has raided the Chancellor's residence and even forcibly acquired the National Preceptor's life-draining formation!"

"...Let her."

"Your Highness, this is terrible! To increase her lifespan, Miss Shen not only plucked your cat bald, she called you a leaky power bank, and now she's going next door to ask the new prince for some pure yang energy!"

The Ninth Prince, Xiao Wuwang, who had sat high above the clouds and remained untouched by the mortal world for half his life, finally couldn't sit still.

A cold white sword beam descended from the sky, smashing the three-zhang-high wall of the Chancellor's residence.

Shen Mingtang looked at the ruins and trembled as she guarded the System balance she'd just earned. "Your Highness, I was only borrowing a little energy to keep myself alive. Was it really necessary to get this angry?"