When it first appeared:

When she was wondering the realm of nowhere and everywhere. Losing hope when it appeared.

Traits:

It focus specially on the connection between people. More specifically, this blade specialises in identifying connections between people and their memories, connection between people and their physical heart and mind and severing them. So she can make specialised nobodies, alongside Normal nobodies, specialised heartless, normal heartless and a total amnesiac or a person with a heart but unable to feel it. Etc etc it can still cut thru anything cuz no magic and it can still find other connections it just focuses more on the the destroying ppl side.