|Cursed Seal of Hell|
|Rōmaji||Naraku no Juin|
|Literal English||Cursed Seal of Hell|
|English TV||Hell's Curse Mark|
"on" is not in the list of possible values (E, D, C, B, A, S) for this property.
The Cursed Seal of Hell is, by far, one of the strongest and most dangerous cursed seals designed by Orochimaru. Planted in Hokuro when he was just a child, during his imprisonment in one of his hidden research facilities, this cursed seal allows the user to gain superhuman abilities, ranging from strength, speed, agility, durability, reflexes, regeneration, endurance and senses. It also boosts the user's chakra levels, gaining absurd amounts of energy. In Hokuro's case, it was applied in the palm of his left hand. However, it is unknown if any other shinobi wields this seal, even though it is highly improbable.
According to Orochimaru himself, this cursed seal allows the user "to transcend beyond even the barriers of humankind". It was later understood that this quote referred to the seal being used in its Level 2's full power.