One of the darkest spells in our world is the imperious curse. This curse can leave a lasting impression of guilt and remorse upon the victims who have had this curse placed upon them.

This curse would land the castor in Azkaban prison for half their life as its "illegal" to control someone else; however I believe its necessary to achieve greatness. All great dark wizards have at some point used this curse. In the time of The Dark Lord, he used this curse to minipulate people inside the Ministry itself, in both the first and second wizarding wars.

To use the curse visit the restricted section- or we could just tell you now.

Firstly with any dark magic you must have a dark and powerful desire for success. You must reach with in yourself and grasp the darkness in your heart. 

Before casting you must have a strong idea of what you wish to achieve 

The incantation is : IMPERIO

It is normal to experience a warm feeling from head to arm to wand as the spell is cast.

Indications of the curse working is white, unfocused eyes and a blank or vacant expression.