"Expression is the manifestation of your will. You could do anything."
— Sheila Bennett to Bonnie BennettExpression is a form of extremely dark and powerful sorcery that draws on energy that is so malicious it would supposedly demolish the world if it were ever called into existence. It stems from an entity called The Darkness, a being who exists alongside God and the universe, and the only being able to overpower the Natural Order, allowing Expression Witches to perform defying feats. According to a witch named Nandi, the forces of expression are considered so powerful that many witches discredit it as magic, for it expands beyond the limitations of both ancient and modern witchcraft.
An Expression Triangle is a magical tool created using a set of three sacrifices of 12 lives in order to grant the witch channeling the sacrifices, godlike power. After being manipulated by the witch turned immortal, Silas, a man named Atticus Shane set out to set up an Expression Triangle and coerce Bonnie Bennett into channeling the power the triangle would create to sever the veil between the living world and The Other Side and revive the dead. As the name suggests, the geographical locations of the 3 sacrifices must happen in 3 places that would form a geometrical triangle. To activate a expression triangle a witch has to go to the sites of the three masecures and concentrate on the spot. When activated the weather becomes more ferocious, causing powerful storms.