Pain inducement

Pain inducement is the ability to inflict pain upon others without actually harming or injuring them.

Jane (Twilight)
Jane possesses a formidable gift, which has been shown to frighten even the strongest of vampires; for this reason, she is feared and shown the utmost respect among both the Volturi guard and the rest of the vampire world.

Her gift is to create an illusion of burning pain: it deceives the mind of her target into believing that the body is truly being burned alive, and thus the tormenting pain is experienced throughout the whole body. A person on whom she uses her gift immediately feels excruciating pain of fire, collapses on the floor, and writhes in pain. Though merely an illusion, it has enough strength to incapacitate any individual and turn them into a helpless target, which is why this power frightens many vampires.

It is also said that Jane can control the level of pain she delivers to her victims. In contrast to her brother's gift which takes some time to take effect, Jane's works very quickly. However, though her brother's gift is capable of working on multiple targets at once, Jane's can only work on one object of her focus.

Since finding Jane and Alec, the Volturi had never fought in a fight where they were at a disadvantage. The only exception came during the confrontation between the Volturi and the Cullens adn their witnesses. Jane, with her gift, and her brother Alec with his gift, are the cornerstones of the Volturi's offense. Together, they are one of the main reasons why the Volturi are referred to as invincible. Despite how powerful her gift is and the reputation it has given her and the Volturi, it is thwarted by one individual, Bella Swan. This is shown during their first meeting; Bella's immunity instantly draws Jane's anger and later hatred.