Resurrection is the power of vampires, hybrids, and witches to bring someone or something back from the dead by magical or supernatural means. Resurrection was made possible 2,000 years ago by a witch named Qetsiyah due to her creation of the Other Side, which prevented supernatural souls from truly passing on.
It is stated that there is always a consequence for bringing someone back from the dead, as it is the will of nature that all living beings must die. However, there are some magical beings who have won against any possible consequence entirely.
Vampires can, in a way, resurrect humans from the dead by giving them their blood while they are still alive. Whether this is from direct feeding or through syringe injection, the end result is the same. If the human dies with vampire blood in their system, they will return to life relatively quickly, although they will awaken in transition to become a vampire and will die again within 24 hours unless they choose to feed on human blood to complete their transition into a vampire. It has also been said that it's possible for a witch to travel to the Other Side and bring back the transitioning vampire's soul to the living world before they feed on human blood, they can be returned to their human state, although such a spell has never successfully been performed.
Through their vampire heritage, when the Original hybrid feeds his blood to a living werewolf and the werewolf is killed, they will be resurrected and awaken in transition to become a hybrid. To complete the transition, they need to feed on the blood of the doppelgänger. If they do not, the transitioning hybrid will begin to feel immense pain and will start to bleed very heavily from their eyes. From there, they go into shock, turn rabid, and eventually die. A transitioning hybrid who drinks the blood of a normal human will not complete their transition, and will produce the same result. Once they drink the blood of the doppelgänger, they become fully resurrected as a vampire-werewolf hybrid. It as also been recently revealed that a werewolf who ingests the blood of the first living hybrid, Hope Mikaelson, dies with it in their system, and awakens in transition, can drink Hope's blood again and be successfully transitioned into a hybrid, as evidenced by Hayley Marshall's transformation.
Witches can use their magic to resurrect others or themselves. This magic is very hard to accomplish, and requires the witch to channel a lot of power. It is considered dark magic because it goes against the laws of nature, which ensures a balance- all living things must die. This spell was first attempted by Jonas Martin to resurrect his son, Luka, after he had burnt to death. He chanted a spell from his grimoire, but he was not powerful enough, and it had no effect. It is also shown that only the most powerful among witches can achieve resurrection, even then with consequences unless the balance of nature is still maintained.
- Emily Bennett was able to resurrect Jeremy Gilbert after he was fatally shot by using her power alone. This is a significant feat, considering the aid of others needed to do such a thing. She was also able to create the Gilbert Rings, which can revive any human who is killed by a supernatural being. Emily was also able to save a dying child by giving it it's mother life force. Being able to do this with her own power is a testament to her strength.
- Bonnie Bennett used this ability on herself, Elena, and Jeremy Gilbert as she harnessed the energy of 100 other witches. She used this ability to cast a protection spell when she faked her death during her first fight with Klaus. She later used the same spell Emily once used on a child to protect Elena from death at Klaus' hands; she channeled John Gilbert's life force into Elena, so that she would return to life, at the willing expense of John's. Later on, after Jeremy was accidentally shot and died, Bonnie accessed the power of a hundred witches in order to bring him back. This marked the first and only time a human being was resurrected directly by a witch's power. Bonnie also brought Atticus Shane back to life using expression to cast a protection spell. She later used the power of the Expression Triangle to temporarily drop the veil to The Other Side, which didn't quite resurrect the beings on the Other Side, but did give their spirits a corporeal form so they could interact with the living world like a living person. She also used three types of different magic to resurrect Jeremy again, except this time, she used opposing types of magic which created enough power to kill Bonnie. Despite her death though, the spell proved to be a success. Following the Other Side's collapse and Bonnie's return from the Prison World, Alaric found a mystical talisman known as the Phoenix Stone, which can allow a witch to resurrect someone from the afterlife, despite the Other Side being gone.
- Esther was also able to return to life, despite being dead for over 1000 years, through channeling the energy of the Bennett line of magic. When Abby Bennett died, this connection was broken and Esther died a few days later, though she later possessed her daughter, Rebekah as a ghost until she could once again bring herself back.
- Qetsiyah also used a powerful resurrection spell to bring herself back seemingly without consequence when Bonnie lowered the veil.
- Sophie, when completing the Harvest (a ritual based on sacrifices and resurrection of the offerings) performed a resurrection spell (The Reaping) to bring back the four girls sacrificed by becoming a Elder, but her spell was hijacked and manipulated into resurrecting four other witches instead of the chosen girls. Those witches/a warlock were Papa Tunde, Genevieve, Bastianna Natale and Céleste Dubois (who was revived by possessing Sabine Laurent).
- Céleste used a form of possession in order to keep on living throughout the centuries after her death. She also performed a protection spell (similar to the one Bonnie used during her confrontation with Klaus) on herself during her confrontation with Davina. She also hijacked Sophie's Harvest ritual and used it's power to resurrect four other witches instead of the sacrificed girls.
- Genevievewas able to resuscitate Hayley from her brief visit to weakened the Other Side due to a curse placed on her by Monique Deveraux.
- Davina performed resurrection in order to bring back Mikael from the collapsing other side by channeling a Nexus Vorti and several dark objects. By drawing power from the listed power sources, she suffered no consequences at all. In Ashes to Ashes, Davina used the one time access to the full power of The Ancestors to try and bring back Kol, but inadvertently brought back Esther with interference from Klaus. In Wild at Heart, Davina resurrected herself from the witch purgatory after losing her anchor to the land of the living, by channeling her heart’s greatest desire, which in itself was a mixture of necromancy and empathic channeling due to its connection to death and to Davina’s emotion. In A Streetcar Named Desire, Davina resurrected Kol by combining Kol's ashes with Klaus and Elijah's blood and channeling a Nexus Vorti for power.
- Markos was brought back to life after 1,500 years, when several dozen Travelers sacrificed themselves by setting themselves on fire while casting a spell. The spell continued on after they died, and when they passed through the Anchor to get to the Other Side, it overwhelmed the Anchor so much that Markos was able to slip out from the other direction. Later on, Enzo, Tyler, Alaric, Stefan, Luke and Elena were all brought back to life using the same spell, after Damon and Elena killed dozens more Travelers and forced Liv to help them with the spell.
- Freya Mikaelson was able to return her brother Finn to life through the use of her talisman by summoning his soul into it upon death, healing the damaged vessel and then putting him back.
Atticus Shane claims that the true immortal, Silas, has the power to raise the dead. It was later revealed that his ability to raise the dead was not his ability at all, but rather a plan he wanted to accomplish by using a Bennett witch to break down the veil between the living world and the Other Side, which would essentially resurrect every dead supernatural being who resided there.
Supernatural Huntresses possess the ability to continually resurrect from the dead at a total of eight times, similar to users of the Gilbert Ring. Moments after their death, their body spontaneously self-combusts only to reborn from the ashes to the age when they received their abilities from the Shamans, akin to a phoenix rising from the ashes. This was achieved through the self-sacrifice of the Eight Shamans, who gave their lives to Rayna with their bodies preserved but each of her deaths caused one of them to decay.
Gilbert RingsHumans can return from the dead completely unharmed while wearing a magic ring. There were previously two rings passed down through the generations of Gilbert children, but after Esther melted one down to use the protection magic to make a white oak stake indestructible, it resulted in there being only one Gilbert ring left. These rings were created by Emily Bennett and Johnathan Gilbert, and were passed down through the Gilbert family. When the wearer of the ring is killed by a supernatural being, force, or entity, they return to life, even if the death itself wasn't supernatural (for example, being stabbed by a werewolf, or being hit by a car driven by a hybrid). Initially, the deceased human returns rather quickly, and are healed of all injuries. If they experience multiple deaths while wearing the ring, they begin to take longer to return, and their injuries take longer to heal. After too many deaths the rings can cause you to be infected with a darkness which will cause the person to develop an alter-ego composed of the human's darkest impulses, such as in the case of Samantha Gilbert, who began killing fellow Founding Family members in 1912, and Alaric Saltzman, whose repressed hatred of vampires caused him to kill anyone who was helping vampires continue to live in Mystic Falls undetected. In the latter's case, it was revealed that Esther spike to him during each of his deaths so that he would become the ultimate hunter.
- Vampire: When a human is revived as a vampire, they must feed on human blood to finalize their return, and must feed on blood to sustain themselves. Once they've transitioned, they develop the usual weaknesses of a vampire, such as the inability to walk in sunlight, being burned and weakened by vervain, and being vulnerable to death by a wooden stake to the heart, decapitation, and heart extraction.
- Hybrid: When a werewolf is revived as a hybrid, they must feed on human blood to sustain themselves, similar to a vampire. They also have a sire bond to their sire that forces them to be supernaturally loyal to them. They are also weakened by both vervain and wolfsbane, and can be killed by decapitation or heart extraction.
- Witch: When a witch resurrects a human, the human is able to see the ghosts, particularly those the human was close to in life (though they can potentially see any ghost with practice.) But, are not able to physically interact with the ghosts, which can make the human feel lonesome, seem insane, or actually become insane. Examples of such humans are Jeremy Gilbert and Matt Donovan. When a witch uses magic to resurrect themselves, they are tied to the power that they used to resurrect themselves through a link, and if the link is broken, they will die.
- Gilbert Rings: At first there are no consequences, and the human will revive rather quickly. If they are continuously killed, they will take longer to revive each time they die. Eventually, it will break their psyche and cause them to go insane, and become murderous. They will develop a split personality and have no memory of what they did while their other personality was in control.
- The only characters that have been revived without consequences are:
- Though Jeremy died a few times and was resurrected by the Gilbert Ring, he never displayed any negative effects like Alaric did
- It is likely that reviving humans through witchcraft is easier than supernaturals through witchcraft. As all known cases of human revival required far less power and were much easier. However when it comes to supernaturals they need an enormous amount of power to do so and even then have failed at times.
- According to Julie Plec, the other side can't be brought back. 
- It is possible if a vampire wanted to be human a witch can put his or her spirit into a human body.
- It's revealed once you die, you're permanently dead (apart from ancestral witch spirits and vampires in the phoenix stone).