Mind Compulsion is an ability of Immortals, Original Vampires, Vampires and Hybrids to control the mind of another simply through eye contact. Sirens and occasionally Witches can also use this power though physical touch and spells, respectively, to facilitate a similar action. Thus far each species have been shown to have the ability to erase the victim's memories or even alter them to the point where something is completely different about them.
Compelled beings usually follow the instructions given to them by the vampire who compelled them to the best of their ability, sometimes even those that would otherwise be beyond their "normal" capacity (i.e. being forced to forget a very recent and otherwise unforgettable experience, cause them to develop new skills, and even create new personalities). Needless to say, this ability plays a vital role in keeping the existence of Vampires (and by extension, other supernatural races) hidden. While most vampires use compulsion with verbal commands, this is not heeded as a necessity, as in one such instance Damon was able to compel Caroline with eye contact alone. However, this method of compulsion has not been used since. Silas however seems to easily do these feats without eye contact or verbal commands when he wants, and can even get into the minds of the Original vampires.
- Immortals can compel the minds of any species with the exception of Supernatural Hunters and Passengers.
- Original vampires can compel both humans and non-original vampires, but not their fellow Original vampires (as Rebekah pointed out to Kol).
- When an Original vampire dies, their compulsion wears off. This can also be achieved if they are neutralized with the White Oak Ash Daggers; this principle still applies if an Original vampire is revived by having said dagger removed later.
- Non-original Vampires can only compel humans.
- Non-original Vampires seem to be aware that they are being compelled while under the effect while humans aren't. However, they are, by no means immune to it, unless they have vervain in their system.
- Witches and Werewolves cannot be compelled by Original and non-original vampires. However it was demonstrated that Silas has the ability to compel witches as seen when he did so to Qetsiyah.
- Hybrids can be compelled by Original Vampires due to their vampire side.
- Compulsion doesn't work if the victim is on vervain.
- To prevent compulsion, Elena wore a pendant which contained vervain, and Jeremy was also given a bracelet with the herb in it.
- Some humans also drink vervain tea.
- In spite of that, Silas was able to entrance Caroline with an advanced form of the ability.
- Vampires who ingest vervain can still compel others without the vervain nullifying the effects.
- Some humans can train themselves to be immune to compulsion.
- When someone is compelled, a new compulsion cannot override a previous compulsion.
- It is, however, possible to plant a new compulsion for so long as it does not conflict with the previous one. As users grow older, their mind compulsion skills evolve and mature.
- When a human who has been compelled in the past dies and is in transition to a vampire, they will remember everything they were compelled to do or forget.
- When a vampire who has taken the cure and becomes human again, they can also remember everything they were compelled to do or forget by an Original Vampire.
- Compulsion can be stripped away by the anti magic barrier due to it's magic nature.
- A witch can also strip away the compulsion placed upon a vampire or human, though the process is painful and can be slow depending on how much or how deep the compulsion is rooted into the victim.
- A Siphoner is able to remove compulsion by Siphoning the magic of the compulsion allowing the person compelled to be free from compulsion.
- Compulsion seems to be tied to the user's spiritual essence, since Klaus was able to use it while inhabiting the body of Alaric, a Human.
Species who can use this ability
All non-Original Vampires possess the ability to compel humans and manipulate dreams and bestow hallucinations such as when Lexi made Stefan think he was lacking blood in Ghost World. They cannot compel other supernatural creatures such as werewolves however.
Due to their Vampire side Hybrids have the same exact powers of compulsion of a non-Original Vampire. That extends to all hybrids, but only those who are half vampire.
Original Vampires have the same powers of compulsion as any vampire however they can compel any non original vampire so long if the Vampire is not on vervain. They cannot compel each other though.
Immortals are the strongest creatures on both shows mentally. They can appear as anyone and can compel without eye contact and even if the target is on vervain. Also they can compel a mass of people at once. They can inflict immense mental pain on targets such as when Silas convinced Klaus he was stabbed by the White Oak Stake.
Witches are able to achieve effects similar to compulsion through magic. The witch Maddox on one instance, controlled the actions of Carol Lockwood including what she spoke, making her mimic his actions like a puppet. After he was done, she did not understand why she did what she did. Several spells have also been used to make people forget, fall under a suggestible trance state and give false visions. Davina Claire once demonstrated the ability removing compulsion, however the process is extremely painful.
Sirens, like immortal, are capable of some of the most potent forms of mind control and thus far, no means of removal have been demonstrated. Sirens, such as Sybil are able to enter the minds of their victims through telepathy which gives them access to their mind in order to read their thoughts, to access or alter their memories, and to an extent their state of conscious and personality. Unlike an immortal's mind compulsion, a Siren's victim is fully aware of their presence within their mind. This interaction creates a psychic bond between them where the Siren can maintain a constant presence from within. This bond also serves to keep her servants close as should they stray too far the victims will be struck with psychic pain and suffer hemorrhages. Sirens initiate their mind control through use of their psychically enchanted voices at a baser level, with their control being as such that those whom have been sirened would even readily set themselves on fire and end their lives. They have also been shown to be able to siren over a dozen people at a time, as shown when Selene uses her power to siren the customers of a diner. Interestingly, vampiric servants have displayed the ability to provide some form of resistance to a siren's ability to penetrate the mind and manipulate the subconscious, but not from their control over them.
- The fact that Silas was a powerful psychic could be the reason vampires possess mind compulsion abilities having been taken from the first immortality spell, and is why it would be present in the Mikaelson family's version of the spell.
- Vampire compulsion appears to only work via eye contact or at a very close range, though more proficient users can perform it at a limited distance away from their victims, as almost every compulsion performed so far has occurred with the vampire using compulsion having their head right next to their victims as they compel them.
- Since Compulsion works by causing the recipient to be subservient to the specific commands issued to them by the Compeller, and that the Compeller can only issue any number of commands at any given time, it is possible to find flaws in the compulsion by exploiting Loopholes.