Lightning Bolt

Often when he was growing up, Tom Marvolo Riddle would sit by the clouded window of his tiny room, and just watch the storms. While the other children in the orphanage sheltered beneath their wafer thin blankets, Tom would just sit and stare. Only one person ever asked him why was Mrs Cole, the owner of the orphanage. He would only say that they were the calmest thing he could think. No one even dared to mention it after that. They didn't want the stare, the gaze that seemed to see right through you, to some unknown destination.

He liked the lightning bolts best. He liked the immense power that they used, the glory of the destruction they caused. When he was very young, he used to say that he wanted to be a lightning bolt. The children laughed.

When he got to Hogwarts, he was amazed at how similar spell trails looked to lightning.

And, finally, as Lord Voldemort, he reminded himself of the power of lightning, both dark and light, as he looked down at Harry Potter, as he created his 7th Horcrux,

"Avada Kedavra!"

And the green lightning faded on the scene, of the body of Tom Riddle, while his spirit fled, and the mark that was forever branded to Harry Potter's forehead. Tom's last act in his real body. A lightning bolt shaped scar.