Oni Mask of Hatred

The Oni Mask of Hatred is one of the three Oni Masks. When worn, it will turn the user's skin into invulnerable magma stone, making them invincible to all forms of damage.

History
At some point in time, the three Oni Masks were created in the Realm of the Oni and the Dragon by the Oni. They would eventually end up in the realm of Ninjago through unknown means, with the Oni Mask of Hatred being sealed away within the Oni Temple deep within Primeval's Eye.

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 would later escape with her fellow Sons of Garmadon members with the three masks during the midst of the battle against the Sea Monster.