Cursed Seal Device (Shinobi World Supplement)
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Wondrous Item, Very Rare (requires attunement)
A scientific ninja tool developed by Tosaka following the Fourth Shinobi World War using research gathered from Jugo, even including some from Orochimaru himself, cursed seal devices are tight-fitting, neck-mounted devices intended to turn even the weakest shinobi into powerhouses.
While wearing and attuned to a cursed seal device, you immediately gain the Cursed Mark and Second Stage features, you can activate said features as a bonus action, they no longer activate automatically, and you gain the Partial Second Stage feat.
If you are no longer attuned to or wearing the device, you lose these benefits. If you are benefitting from Cursed Mark or Second Stage, you automatically take 30 necrotic damage when this happens. A creature attempting to remove the device against your will must succeed a Strength (Athletics) or Dexterity (Sleight of Hand) check as an action against your passive Athletics or passive Acrobatics, your choice, as an action in order to do so.
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