This is a ancient Lost Magic only given to by the Grim Reaper. Dark Magic is quite like Black Magic which comes from the Black Arts but is slightly different because it's only taught by the Grim Reaper that allows you to gain abilities from the Underworld and with this, you can control death itself as it can allow you to create dark energy from your finger tips. This magic is so powerful, that it has been said that it can take a person's life in a blink of an eye. The Leaders of the Magic World has forbidden their people from studying this dangerous magic and if the Magic Council is to find a user researching such a magic, they are to be put Death.
Dark Magic was first made by the Grim Reaper himself. He use this to keep order in the Underworld and maintain it so that Hades, the God of the Underworld and Hell, could have less trouble worrying about his realm. However, how the magic got into Earth Land is unknown and the only ones who knew of this is the Grim Reaper himself and his son. Stories has it that the soul of a little girl escaping the Underworld had somehow learned of this terrible magic while others say a little boy with a corrupted heart so impure as Hades gained this. The mysterious surroundings of this has yet to be told.