Madara Turns Edo Tensei's Release Into a Loophole
SPOILER!
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Kabuto Releases the Jutsu · Madara Performs the Seals · Contract Severed
When Itachi forces Kabuto to end Edo Tensei, the reanimated army begins disappearing. Madara knows the technique well enough to perform the release seals from the reincarnated side and sever his own contract before his soul returns. A forbidden technique created to control the dead has produced a dead shinobi who no longer answers to the summoner.
Why it matters
The danger of Edo Tensei is not only that the caster can weaponize the dead. Once enough knowledge of the technique survives, the system itself can create outcomes its current user cannot fully control.
Debut: Ep 336 - Kabuto Yakushi