The Purple Spider

Unbeknownst to the Phantom Troupe, there is another member that is reserved for desperate times only. Number 0: Chishio Lucifer, Chrollo's younger sister.
She was the apple of his eye, the only person he truly cared for, the only person he shows love and affection to.

Her brother sent her on a mission to find some legendary ancient relics that the others couldn't, she was reserved for desperate times only because of her Nen; Blood Nen Art.
a forbidden Nen ability that haven't been used in thousands of years, and she was the first one to learn this extremely difficult Nen ability after thousands of years.
Why is it forbidden? because it's very dangerous, extremely dangerous actually. Even to learn it takes an extreme amount of training to get to the first step, but she did it, quiet easily in fact.

Sorry if it's cringe lol.
I'll try not to make this one of those cringy Y/N stories, also that's probably why I never do Y/N stories and why I write OC's instead.

the troupe is planning another heist, but this time the Auction have five times the security than last time. Chrollo decided to call his sister and get her to heist the auction, coincidentally she's going back anyways.