Bonnie Bennett

Discovered she was a witch as a teenager, used her powers to help fight evil
Lernt the power of Expression, became one of the most powerful witches in the world
Use spirit, Expression, & dark magic all at once to bring Jeremy back from the dead, died while doing so
Became the Anchor to the Other Side, allowing her to exist on both sides, living & dead
Trapped in a prison dimension with Damon, after the other side collapsed
Eventually freed herself & Damon, her life was magically linked to Elena;
As long as she lived Elena slept as part of a curse casted by Kai Parker
Powers were temporally suppressed, magically destroyed Hell