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The Master Sword is created from the Goddess Sword after being upgraded by all three Sacred Flames. It has the power to repel evil.
Upgrades
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True master sword
After travelling through the Gate of Time, Zelda will finish the creation of the Master Sword and it becomes the True Master Sword. The True Master Swordis identical in terms of power for regular slashes and the Spin Slash. However, the Skyward Strike is stronger, and it now deals 16 points of damage.You can now charge Skyward Strikes even faster and they travel even farther.
Note that you can't upgrade this sword farther.