''Suspecting that Ganon's power was based on the Triforce's magic, the people of Hyrule forged a sword resistant to magic which could repulse even powers granted by the Triforce. This mighty weapon became known as the blade of evil's bane, or the Master Sword.'' ~aLttP manual.
"However, it could not be assumed that only a good person would get their hands on the Triforce. For that reason, the people of Hyrule were told by the gods to make something that would repulse any evil that may kidnap the Triforce: the blade of evil's bane." ~aLttP JP manual.
Are these the quotes?
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"Gonna need more chloroform..."
"If you look down on us, judge us, condemn us... then you shall fear us!"
I suppose it's a good thing Keyblades are fail safes to the literal creator of the universe in Kingdom Hearts, otherwise the Master Sword might indeed have more wank on it's side.
"Keyblades are said to be man-made counterparts to Kingdom Hearts."
~Xehanort's Report VII
Which is not factoring in the ultimate weapon of the KH verse, the χ-blade. Which going by it's description really would offer omnipotence.