Please be warned, the following legends may or may not have been proven and may or not even be slightly true, they can contain graphic content.
The many legends of "Idenn", "Denny", "Death herself/itself", "leader", "Den", "Ide", etc
They say once she killed a man just using a single piece of paper.
They say she can crawl right through her computer's monitor out of yours and kill you ebefore you even know what happened.
They say that she herself killed the grim reaper and took it's place.
Feel free to add more to this.