Katherine
She was a few seasons ago so I've forgotten about her.
Why is she going to be more feared than Cade now he's been destroyed?
I know I'm excited, as a fan, to see her one last time, but I can't exactly remember what was going on when she died...
All I remember is she got the cure, tried to redeem herself eventually by helping Stefan with some sort of depression (?) , and ... eventually was dragged into Hell???