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PFS StandardFinal BladeItem 20

Source World Guide pg. 126
Bulk 40
A Large or smaller restrained or willing creature can be executed by a final blade. As an artifact, a final blade cannot be harmed by any but a very specific means.

Activate 1 minute (Interact); Effect You execute a creature restrained beneath the blade. The executed creature takes 11d10 slashing damage and must succeed at a DC 45 Fortitude save or be decapitated as though it suffered a critical hit with a natural 20 from a +3 major striking vorpal scythe. The soul of a creature executed with a final blade is trapped, and the creature can’t be returned to life through any means, even a miracle or similar magic. A final blade can hold any number of souls in this way, and they can be released only through a complex ritual known only to the Gray Gardeners or through the destruction of the final blade.