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Effect: While wearing this item, your weapon attacks gain the devastating ability to defeat a humanoid opponent with a single decisive blow. On an attack roll of 20 which is confirmed as a critical hit a humanoid target will be killed. Powerful humanoids may resist the vorpal strike and instead take 100 points of damage until they have been sufficiently weakened.
Found on: (9) Manslayer items:
Note: This effect works with all types of weapons - melee, ranged, and unarmed.