Noh Mask

The was an evil mask carved from a  with a shard of the Shikon no Tama in it.

History
It was sealed by Kagome Higurashi's ancestor who exorcized it many years ago and placed in a box. There it remained in silent until Kagome brought her shards of the Shikon no Tama with her to the present. The seal on the box was then broken and set the shed on fire. It then tried to attack Grandpa, but instead found a faceless wooden warrior and attached itself, only to have it fall apart a couple of seconds after. Thereafter it started to attack him again in an attempt to devour him, but he managed to survive thanks to sutras he didn't write himself that were placed on his face. The fire department and police soon arrive. Kagome overhears a few skaters talking about the fire and rushes back to her home. Gramps is sent to the hospital, although he is not badly injured. While Kagome's mother stays at the hospital with Gramps over night, Kagome is left in charge of her younger brother Sōta. Meanwhile, in the shrine store house, some firefighters were looking around. One is attacked by the Noh Mask and it drives a fire truck at top speed. Kagome goes to the hospital and her mom tells her that he's still unconscious. She then shows her the talismans that he used to protect himself from the mask. He keeps saying "Beware of the Flesh-Eating Mask."

Later, the Noh mask tries to attack Sōta and retrieve the shards of the Shikon Jewel, but is thwarted at the last second when Inuyasha uses his Tessaiga to slice through and destroy it for good.

Powers & Abilities
True to its name as a "flesh-eating mask", the Noh Mask devours flesh in order to move freely. Though, without flesh, it is simply a mask that is able to simply float and hides until it attacks an unsuspecting human. Once it gains flesh, it is able to form a liquid body, which allows it to increase its range of absorbing flesh. It is noted that the Noh Mask may have the ability to absorb a person's knowledge as it is seen being able to understand that it was asleep for hundreds of years and awakening in a completely different era, where mythical things such as demons and the Shikon no Tama no longer exist, as well as knowing how to operate a fire truck, despite the fact that motorized vehicles didn't even exist in the era before the Noh Mask was sealed, being seen driving it and controlling the fire apparatus as it searched for other shards of the Shikon no Tama.

Manga vs. Anime

 * In the manga, the Noh Mask was in the possession of a woman who recently inherited it as a family heirloom. She was bringing it to Higurashi shrine in order to purify it before it killed her by possessing her flesh. In the anime, it was in the possession of the Higurashi family from the beginning of the story.
 * The Noh Mask's organic body differed between the manga and anime. In the manga, it was a collection of fused body parts cobbled up into a blob-like form, still showing hands, feet and bare breasts. Due to censorship reasons, its appearance was changed to that of a dark-colored slime like form shaped into the outline of an onmyōdō.
 * The killings of teenage delinquents and the car crash involving Umao and Shikako were not present in the anime.

Trivia

 * A conundrum is made by this mask, since the jewel shard in the mask was collected in the present and not the past, it stands to reason that the shard still exists in the past uncollected. This was brought up at a convention where Rumiko Takahashi was a guest speaker, who merely stated it was an error in logic and should just be overlooked.
 * A second conundrum arises in the fact that Kagome had been in possession of the complete Shikon no Tama since birth, so it's bizarre that a single shard would awaken the Noh mask when the jewel in its entirety did not. However, it could be possible that the jewel hadn't "activated" yet because it was part of Kagome's body.

Media appearances
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Manga

 * Chapter 23
 * Chapter 24
 * Chapter 25
 * Chapter 26
 * Chapter 27

Anime
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 * Episode 11

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