(Under reconstruction! Sorry!)
The author of this article will soon improve this article soon.
It also almost took Severus Snape's life two different times:
The first, when he was a young boy of four, he didn't know about the danger and got trapped in a sinkhole while helping his mother gather valerian.
The second time a heartsick Severus, feeling he had no purpose or reason to continue living, intentionally went to the fen to end his own life, sending a Patronus to his mother.
Roderick Prince and Albus Dumbledore got there just in time to rescue him. Roderick told his grandson he wouldn't die alone if he did this, fully intending to follow him. That shocked Severus enough to reach for his grandfather's hand. The second their hands clasped, Dumbledore levitated them both to safety.This incident included the only time Eileen ever slapped her son. An entry written with a shaking hand in Eileen's diary states what happened.