Ancient Elder Oak Ash Dager

The Elder Oak Ash Daggers are weapons which were forged by witches as a means of subduing the Original Vampires. By appearance, they resemble a simple thin silver dagger with an intricately designed hilt. If dipped in the ashes of the Elder Oak Tree, dating from the genesis of the vampire race, and placed in the heart of a primordial Vampire, they almost instantly desiccate, neutralizing them where they remain "dead" for as long as the dagger remains in the Primordial's heart.

The daggers must be used only by humans, because if it is wielded by non-Primordial vampires and possibly Werewolves, the dagger will claim both lives. The daggers were originally owned by the first members of the Brotherhood of the Seven, supernaturally enhanced vampire hunters.

The Primordial Vampire Kaleb Mikaelson wanted to make a dagger work on Klaus as payback for all the times Klaus daggered him. His knowledge of magic showed that he knew how to transform one of the silver daggers into a gold dagger, a dagger that could neutralize Klaus as a magic loophole to his werewolf gene, as he could not replicate the original spell that made the daggers. As Kaleb was possessing the witch Kole, Kaleb and Davina successfully created a gold Elder Oak Ash Dagger from a silver Elder Oak Ash Dagger by using Kemiya.

History
The daggers are known to have existed as early as 4900 years before the events in Pilot, back in the 32nd century. The original known owners were the members of The Seven. It is unknown if the witch who enchanted the daggers was the same witch of The Five, or someone else, but the former is most likely.

Magnus showed Veronica his dagger and explained that it was a weapon to use against a special kind of vampire (referring to a Primordial Vampire) and that it would serve as a useful weapon until they could find the cure and permanently kill the Primordial Vampires. He then plunged it into Veronica's heart. On the same night the others tried to disable the Primordials, daggering all of Veronica's siblings. However, due to Klaus' Werewolf side and the fact that the daggers were made of silver, the dagger didn't work on Klaus. Their plan backfired when the hybrid killed them all in retaliation.

Klaus revived all of his siblings but Finn, and kept the daggers for whenever he wished to impose his will over his siblings. He would use the daggers when in disagreement with his siblings, such as when he daggered Kaleb in 1702, 1821 and 1914 and Rebekah in 1835, 1922 and 2011. Keeping the daggers in their hearts kept them neutralized so Klaus kept his daggered siblings wherever he went, resting in coffins until he was comfortable re-awakening them.

Silver Daggers
The Silver Elder Oak Ash Daggers can be used on all the Primordial Vampires except Zander. These daggers were repeatedly used by Klaus against his siblings, especially Veronica and Kaleb.

One of the daggers ended up in the possession of Ben Grayson, who tried to have Damian Sullivan use it on the Primordial Vampire, Erik, knowing that if a vampire tried to use it on a Primordial, they'd die from using it. This was discovered though and Alaric Saltzman stabbed Elijah with it instead. However, he was unaware that removing the dagger from the body would revive the Primordial, Erik waking shortly afterward. He was stabbed once more, this time by Ellie Grayson, who left the dagger in his body this time. The Sullivans kept Erik’s neutralized body in their cellar. In, Zander, Ellie felt he was the only one who could take on Zander, she removed the dagger from his body and gave it to him as a peace offering, showing him she did not intend to threaten him again. In As I Lay Dying, Zander broke the curse that prevented him from returning to his own body and once he did, daggered Erik and stored him in a coffin with the rest of his siblings.
 * -|Season Six=

Zander removed the dagger from his sister once he needed her to figure out why he couldn't make successful hybrids. Upon awakening, she stabbed him with the dagger, knowing it wouldn't kill him but hoping it would hurt him, which it did. When Ragnar came wanting to hunt down Klaus with a Elder Oak Stake he had, the only weapon that could completely destroy a Primordial, he had Ellie dagger him as part of the plan to lure Zander to kill him. He was then undaggered once they had set their trap. In Homecoming, Ellie used the dagger on Rebekah, neutralizing her once more, fearing that she would betray them and aid Zander. Rebekah was kept in the Sullivan cellar like her older brother, Erik, had been. In The New Deal, when her body was returned to Klaus, he removed the dagger but had then learned that Rebekah was now aware of the fact that Klaus had killed their mother, pushing the dagger into her once she started to awaken, fearing her reaction. In The Ties That Bind, The coffins of the neutralized Originals were stolen and after a struggle, returned to Zander, but Damon had pulled the dagger from Elijah's chest when he returned him, reviving Elijah. In Bringing Out The Dead, Elijah removed the daggers from the rest of his siblings who were far from happy with Klaus. Finn and Rebekah stabbed him with the daggers, knowing they wouldn't neutralize him but would hurt.
 * -|Season Seven=

In All My Children, after the Originals were linked as one, the Salvatores gave the dagger they had possession of to Alaric Saltzman, who daggered Kol, which neutralized all the Originals but Klaus, who quickly found them and removed the dagger from his younger brother. In Do Not Go Gentle, After Esther had possessed Rebekah, she had Alaric dagger her daughter while she returned to her original body. Once she died, Klaus removed the dagger from Rebekah.

When Klaus thought Rebekah knew too much about the cure, risking their search for it, he daggered her once more. In O Come, All Ye Faithful, her neutralized body was found by April Young who removed the dagger. In Catch Me If You Can, When Kol discovered the truth about the cure and the ancient immortal Osiris, he tried to stop the hunt for the cure and Rebekah threatened to dagger him, which upset him greatly, in disbelief that she would resort to daggering siblings like Klaus did. In A View to a Kill, Kol stole the rest of the daggers from Klaus, with only Rebekah remaining in possession of one, which she eventually gave to Stefan.
 * -|Season Four=

In Always and Forever, Klaus used one of the daggers to once again neutralize Elijah, seeing him as a weakness that Marcel could use against him. In truth, he made a deal with Marcel to dagger Elijah and give him his body as a way of being allowed into his inner circle.
 * -|The Originals Season One=

Golden Dagger
The Golden Elder Oak Ash Dagger was created by Kol while possessing the witch Kaleb's body with the help of Davina. It was created from Kemiya to neutralize Klaus alone. After getting the paragon diamond back in the present day, Kol and Davina successfully made the golden White Oak Ash Dagger before Kol dies. Before his death, Kol told Davina to keep the dagger to protect herself from Klaus if she needed to. The Dagger was used on Klaus for the first time by Elijah. Later the dagger was destroyed (melted) by Dahlia.

Before the series

 * Seven owned by the Brotherhood. One put in each Primordial. Removed by Klaus from all but Finn, which is left in him from 3114 B.C.E to 2010.
 * One left in Kaleb from 1702 to 1821.
 * One left in Kaleb from 1821 to 1901.
 * One left in Kaleb from 1914 to 2010.
 * One left in Veronica from 1835 to 1887.
 * One left in Veronica from 1922 to 2010.
 * Mikael has one.
 * Klaus has one.

Season Six

 * By this point, one is in Finn, one in Kol, one in Rebekah, one owned by Mikael, one owned by Klaus, and one owned by John.


 * One acquired by Ben and given by him to Ellie and the Sullivans.
 * Used on Eli ,
 * and given to him by Ellie
 * Klaus uses his on Eli.

Season Seven

 * By this point, one is in Finn, one in Elijah, one in Kol, one in Rebekah, one owned by Mikael and the location of the dagger given to Elijah by Elena is unknown.


 * Klaus removes Rebekah's dagger, meaning he now owns one not being used.
 * Mikael gives his dagger to Elena to use on him. She then uses it on Rebekah.
 * This means that four are in the Original siblings, one is with Klaus, and Elijah's is unaccounted for.
 * Damon removes the dagger from Elijah. He takes it.
 * Elijah removed the daggers from Finn, Kol and Rebekah. They attack Klaus with them.
 * Damon gives his dagger to Alaric, who uses it on Kol. Klaus removes it and takes it.
 * He now has one, while each of his siblings presumably have theirs, and the one given to Elijah by Klaus is unaccounted for.
 * Esther gives a dagger (likely Rebekah's or Finn's) to Alaric to stab Rebekah with. Klaus removes it.

Season Season

 * By this point, Klaus seems to have recovered the daggers left in Finn and Kol, has taken two used on Rebekah, and the one used by Alaric against Kol. The whereabouts of the one given to Elijah by Elena are unknown.


 * Klaus uses a dagger on Rebekah.
 * April removes it and Rebekah keeps it.
 * She later gives it to Stefan.
 * Klaus' four are stolen by Kol.

Season One

 * By this point, Stefan owns one, and Klaus has inextricably come to own three, likely reclaiming them after Kol's death. The whereabouts of the dagger that Elena gave to Elijah are unknown. Another dagger seems to be missing, perhaps hidden by Kol.


 * One dagger is used by Klaus against Elijah.
 * Davina accidentally revives Elijah, and he keeps the dagger.
 * Klaus' other two are stolen by Hayley and given to Rebekah.

Season Two

 * By this point, Stefan owns one, Elijah owns one, and Rebekah owns two and Davina owns one. One is missing; the one that Elena gave to Elijah.


 * The gold dagger was used on Klaus, being the first time Klaus has been neutralized by one of the Elder Oak Ash Daggers.
 * Klaus used the gold dagger on himself to incapacitate Dahlia while she was linked to Klaus. The Dagger was later melted by Dahlia and destroyed.

Season Three

 * Elijah daggers Veronica to fulfill the remainder of the prophecy against them as well as keep the curse inflicted on her from turning her into a mad ripper.
 * Davina daggers Kaleb at his request in an attempt to prevent him from completing his task of killing her.

Season Four

 * Klaus attacks Kaleb with one of the daggers to punish him for "betraying" the family to protect Davina.

Usage

 * The dagger has to be dipped in the ash of the white oak tree. Then a human has to plunge it into an Original vampire's heart as it would kill the vampire who plunges it. This will neutralize the original for as long as it remains in the heart.
 * It is unknown if or not the dagger has to be dipped every time, before it is wielded. Klaus, once, in a fit of rage, pulled out Kol's dagger to kill Elijah but didn't go through with it. It probably wouldn't have worked.
 * In Girl in New Orleans, Davina pulled the dagger from Elijah's chest, inspecting it before plunging the dagger back. Elijah woke up several hours after. This seems to support that the daggers only work if dipped in White Oak Ash each time.
 * It is not supposed to be wielded by demons as it would claim both lives - of the Original as well as the demon. It is not yet known what falls under the definition of demon, but normal vampires are known to be included (the word "demon" probably refers only to vampires as the original owners, the five, have only referred to them as demons).
 * A definitive scene depicting what exactly happens to vampires, when they use it, has not yet been shown. However, it is possible that some vampires must have attempted to use it, which is why the writings suggest that demons mustn't use them.
 * Apparently, Original Vampires themselves don't seem to be under the definition of 'demon'. Still, Klaus has been the only one who has ever daggered his siblings on screen. It might not affect Klaus for three reasons:
 * Original vampires were made to protect themselves; nature didn't consider them as demons. Rebekah attempted using the dagger on Kol but she didn't go through with it, so it is unknown what happens to originals other than Klaus when they use it. But after Elijah daggered Klaus, it appears that nothing happened to the original in question.
 * Klaus has a werewolf side, so silver based magic never worked on Klaus. Even if other Primordials could get neutralized along with the Primordial they daggered, the same wouldn't affect Klaus. This by extension also means that werewolves can safely dagger a Primordial.
 * The Spell that created the Primordials decreed that only wood from the Elder Oak Tree can kill them. From this perspective, it would explain why Klaus can safely dagger another Original.
 * It is unknown what happens if the daggers are used on normal vampires.
 * It is possible that nothing happens, and they just heal once the daggers are removed, as the spell that enchanted the daggers is only known to be meant for Primordials.
 * However, all weaknesses of Primordials have been generalized in normal vampires (any wood kills vampires as opposed to Originals dying only off of white oak wood). Wood just temporarily disables originals. So, it is possible that the daggers would kill a vampire permanently.
 * It's unknown whether or not hybrids can use the dagger since the only known ways to kill a hybrid are decapitation and heart removal.
 * According to Elijah in Girl in New Orleans, removing the dagger even once would negate its power, even though it is later plunged again.

Victims

 * Elijah (neutralized by Alaric Saltzman, Elena Gilbert, Klaus and The Seven)
 * Rebekah (neutralized by Alexander, Klaus, Elena Gilbert, Alaric Saltzman and Elijah)
 * Mikael (neutralized by Elena)
 * Kol (neutralized by The Five, Klaus, Alaric Saltzman and Davina Claire)
 * Finn (neutralized by The Five and Alaric Saltzman)
 * Niklaus (neutralized by Elijah and himself)
 * Ariana (neutralized by The Five, Klaus and Alaric Saltzman

Trivia

 * The daggers strongly resemble the seven "holy daggers" that were featured as the means to kill the Antichrist, "Damien", in film series.
 * This acts as a balance in Nature so Humans can fight them, since the White Oak Tree was burned down, leaving no weapons to permanently kill the Originals.
 * This is unlike the White Oak Stake, which will kill an Original Vampire permanently.
 * Klaus is shown to threaten his siblings by the threat of silencing them with this dagger,
 * For now, Rebekah has all the daggers, except one, which is supposedly with Elijah as he is "revived" with the dagger in his chest.
 * Klaus has all the daggers at first, but he used one on Elijah, and the others were stolen by Hayley who gave it to Rebekah.
 * Though Klaus is the Original that always daggers the other Originals, none of the daggers is in his possession now. Instead, the daggers are with his undead siblings, Elijah and Rebekah.
 * Klaus is currently the only Original that has used it on his siblings, Rebekah tried to use it on Kol, but she did not.
 * Elijah has broken this trend in When the Levee Breaks, as Elijah daggered and neutralized Klaus with the gold White Oak Ash Dagger that was made to exclusively work on Klaus.
 * Elijah once again breaks this trend in Savior, when he daggers Rebekah upon her insistence.
 * Kol and Rebekah are the most common victims of the daggers.
 * Though being daggered quite a lot of times, Elijah seems to be daggered for the least amount of time with Kaleb being daggered at least 295+ years, Rebekah being daggered at least 140+ years and Finn being daggered at least 4896+ years. The only exception is Klaus that can't be affected by the dagger and Ragnar who is daggered for less than a year, but he is entombed by Abby and daggered by Ellie, making him neutralized longer than Elijah.
 * The reason why Klaus never died from neutralizing his siblings is because of his werewolf lineage.
 * Kol mentions that the hunters forged the white oak ash daggers and since the brotherhood of five were seen with them in the flashbacks they are presumably the ones who created them while the witches who spelled them are still unknown.
 * Kol reveals that the spell to create the daggers is impossible to replicate but the element of the daggers can be changed. Example from silver to gold.
 * In When the Levee Breaks, Elijah used the gold dagger for the first time to neutralize Klaus, as he was becoming too dangerous and unpredictable regarding his plan to kill Dahlia and protect his daughter Hope.
 * Presumably the daggers exist in the prison worlds, just with no Original to be stuck inside.
 * Elijah was able to dagger Rebekah, proving that Originals do not suffer any ill effects from using the daggers.
 * Rebekah, when asked by Marcel, described the effects of the dagger as being 'like a deep dreamless sleep'.
 * However, Finn later reveals the caveat that Rebekah's statement holds true only for those daggered for decades. Over the course of centuries, an Original's consciousness will slowly return to them, even daggered, however their bodies will remain dead.