"Even the most sweet-faced little goody-goody has a drop of evil in his heart. I can make that little drop in you expand and expand and expand until... You're blown to bits!!!"- Devil (DB104)
The Beam of Evil is The Devil's signature move. It's a highly dangerous technique that kills the opponent by using the latent evil in their soul against them, making it grow and grow until it destroys them in an explosion. However as he learned when using it on Son Goku, those with pure hearts cannot be harmed by the technique.