Oni Masks

The Oni Masks are three powerful masks created by the Oni. Each mask has a unique individual ability that is derived from the three Oni warlords, while all together they can open a portal to the Departed Realm and bring Garmadon back to Ninjago as the evil four-armed villain, Lord Garmadon. It was Harumi and the Sons of Garmadon's ultimate goal to find and unite the three masks in order to bring Garmadon back to life and conquer Ninjago.

History
At some point in time, the three Oni Masks were created in the Realm of Oni and Dragons by the Oni. They would eventually end up in the realm of Ninjago through unknown means, where they would be seperated around the island.

The Mask of Deception
Members of the Sons of Garmadon, lead by Mr. E, infiltrate Borg Tower, which housed the Oni Mask of Vengeance. The Sons of Garmadon proceed to escape the building with the mask after triggering an alarm, but they are suddenly caught in a battle with Lloyd. While the other Sons of Garmadon members were swiftly beaten, Mr. E manages to escape from Lloyd with the Oni Mask of Vengeance in tow.

Three days later, the full Ninja team arrive and reunite at Borg Tower, where they meet Hutchins, who informs them about the Oni Masks and how they would give the user tremendous power if they were ever united. He also informs them that the Oni Mask of Deception is currently being guarded at the Royal Palace. The Ninja are later assigned by the Royal Family to protect the Oni Mask of Deception from a potential Sons of Garmadon attack in the future.

The Jade Princess
As predicted, the Sons of Garmadon attack the Royal Palace in hopes of stealing the Oni Mask of Deception. While Ultra Violet and several other Sons of Garmadon members fend off against the defending Royal Guards, Mr. E rides his bike through the palace and eventually finds where the mask is located. However, the Ninja corner him in front of the mask's display case. Unknown to the Ninja, Mr. E brought along the Oni Mask of Vengeance and puts it on, where it gives Mr. E two additional arms and swords. Mr. E fights off the Ninja, eventually knocking them down after utilizing the mask's power to use Jay's Lightning against them. As Mr. E claims the Oni Mask of Deception, Kai, in a last-ditch attempt to stop him, blasts a fireball at him, which ultimately shatters the Oni Mask of Deception in his hands.

However, it is revealed that the Oni Mask of Deception that was on display was a fake; Hutchins had hidden the real mask in the vaults below the palace and tasks Lloyd and Harumi with fleeing with it. However, they are soon chased down by Ultra Violet and a few Sons of Garmadon members, who manage to knock it out of Harumi's hands and claim it before Lloyd and Harumi can.

The Oni and the Dragon
Mr. E uses the Oni Mask of Vengeance to fight the Ninja while trying to escape. When fighting Lloyd, the latter manages to knock the mask of Mr. E's head, undoing the effects on him. However, Mr. E manages to escape with the mask with an undercover Zane, who saved him only to gain his trust.

Snake Jaguar
Killow uses the Oni Mask of Deception to lift rocks into the air in attempt to crush Zane during the bike race after finding out he was a spy, trying to make him lose the race. However, Zane manages to dodge all of his attacks, forcing Killow to escape with the mask while Mr. E fights Zane.

The Quiet One
Killow uses the Oni Mask of Deception's telekinetic powers to create a bridge of rocks over a trench for the Sons of Garmadon to cross in order to reach the crashed Destiny's Bounty. After reaching the Bounty, Killow and Mr. E both put on the Oni Masks of Deception and Vengeance on, respectively, when confronting the Ninja.

Game of Masks
Lloyd and Harumi manage to locate the Oni Mask of Hatred within the Oni Temple. Harumi attempts to grab it, but a force makes it so she cannot. She then explains to Lloyd that someone with Oni blood can obtain the mask. After Lloyd takes the mask, he soon begins to question Harumi on how she knew that he was part Oni. After a moment of revelations, Lloyd discovers Harumi's true intentions and realizes that she is the Quiet One. A fight then ensues, with it ending with Lloyd throwing the Oni Mask of Hatred over the side of the platform. However, Harumi dives after it, catching it while she manages to use her knife to hold onto the side of the platform.

Armed with the Oni Mask of Hatred, Harumi puts it on, using its powers to jump back onto the platform. Lloyd questions what the mask did to her, where she reveals that it has made her invincible to all forms of damage. After a very brief fight, Harumi reveals to Lloyd that she wants him to feel the pain she has felt following the death of her parents by having Lord Garmadon destroy Lloyd. Harumi then proceeds to flee from the temple with the mask, utilizing her invincibility to destroy the temple in an effort to destroy Lloyd.

Harumi soon regroups with the Sons of Garmadon, where she takes off the Oni Mask of Hatred as Killow rejoices that they now have all three. Harumi then explains they have a ceremony to attend to, ordering the Sons of Garmadon to take the Destiny's Bounty. However, they are confronted by the Ninja. Lloyd soon returns, and as the Sons of Garmadon surround the Ninja, the beast Harumi and Lloyd saw earlier then appears. The Ninja then fight the beast, with Mr. E and Killow utilizing the Oni Masks of Vengeance and Deception to help fight the beast. While the Ninja are distracted with fighting the beast, Harumi orders her forces to retreat with the masks. As they get away with the Bounty, Lloyd attempts to stop them, but is soon captured by Killow.

Dread on Arrival
Killow and Ultra Violet use the Oni Masks of Deception and Hatred to fend off the Ninjago police force while Harumi and the other Sons of Garmadon members help finalize the Temple of Resurrection within the Royal Palace.

Later on, Mr. E, Killow, and Ultra Violet all place the three Oni Masks into position at the ceremony. The masks then levitate from their hands, floating in a triangle formation. As Harumi recites the ritual, the three masks light up, connecting each other with beams of energy, which soon creates a rift to the Departed Realm. Eventually, the Ninja arrive to stop the resurrection of Lord Garmadon, where they are successful in rescuing Lloyd and Misako and preventing Harumi in finishing the ritual. The Ninjago police force soon arrives and arrest the Sons of Garmadon, and presumably confiscates the three masks. Despite this however, the Ninja were too late; Lord Garmadon, though incomplete, was reborn.

At some point, the Oni Masks would be recovered by the Sons of Garmadon, although it is exactly unknown when and where they recovered them.

Big Trouble, Little Ninjago
Harumi would use the Oni Mask of Hatred after she confronts the now powerless Lloyd and Toddler Wu on a rooftop. She would continue to chase Lloyd while using the mask's powers to her advantage. Eventually, Harumi confronts Lloyd on a monorail, but Lloyd was able to throw Toddler Wu to the Ninja on the Bounty, who were then forced to use the Traveler's Tea that Mistaké gave them earlier to escape to the Realm of Oni and Dragons after Garmadon's Colossi beast destroys the Bounty. After Lloyd escapes Harumi with Nya, Misako, and P.I.X.A.L. in the same fashion Mr. E did prior, Harumi takes off the mask while angrily looking towards Lloyd.

List of Masks

 * Oni Mask of Vengeance (Red) - Turns the user into a master swordsman with two additional arms and gives the user the ability to absorb and deflect other people's powers. This mask was kept in a secret compartment within Borg Tower before it was stolen by the Sons of Garmadon during "The Mask of Deception." It is the preferred mask of Mr. E.
 * Oni Mask of Deception (Orange) - Allows the user to control, move, and manipulate objects by using telekinesis. This mask was guarded by the Royal Family in the Royal Palace before Ultra Violet recovered it from Lloyd and Harumi's possession during "The Jade Princess." It is the preferred mask of Killow.
 * Oni Mask of Hatred (Purple) - Turns the user's entire body into invulnerable magma stone and lava. This mask was hidden in the Oni Temple deep within Primeval's Eye before it was stolen from Lloyd by Harumi during "Game of Masks." It is the preferred mask of Harumi and Ultra Violet.

When all three are united together at the Temple of Resurrection, the user can bring back Lord Garmadon from the Departed Realm.

Appearances
{{Scroll|
 * 70639 Street Race of the Snake Jaguar (Vengeance)
 * 70640 S.O.G. Headquarters (Hatred)
 * 70641 Ninja Nightcrawler (Hatred)
 * 70642 Killow vs. Samurai X (Deception)
 * 70643 Temple of Resurrection (All)

Season 8: Sons of Garmadon

 * 75. "The Mask of Deception"
 * 76. "The Jade Princess"
 * 77. "The Oni and the Dragon"
 * 78. "Snake Jaguar"
 * 80. "The Quiet One"
 * 81. "Game of Masks"
 * 82. "Dread on Arrival"
 * 84. "Big Trouble, Little Ninjago"}}