The Reaper Death Seal Has a Release — and the Release Still Demands Blood
SPOILER!
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Shinigami Mask · Souls Returned · The User Must Cut Open Their Own Body
The
Dead Demon Consuming Seal appears absolute because caster and victim are both trapped inside the Shinigami. The Uzumaki mask ritual reveals that even this prison has a release mechanism. Orochimaru can free the souls sealed by Hiruzen and recover his arms, but the ritual requires the wearer to let the Shinigami possess them and cut open its stomach through their own abdomen.
Why it matters
Naruto's forbidden techniques often have loopholes, but the loophole does not make the original cost fake. Escaping one consequence usually means finding somebody able and willing to pay another.
Debut: Ep 363 - The Allied Shinobi Forces Jutsu