The Forging of Sword and Hero

Link encounters Groose while falling to the Sealed Grounds. In the temple, the old woman teaches Link the Ballad of the Goddess, causing an inactive Gate of Time to appear. <br><br> At this time, the seal on the Imprisoned becomes too weak to hold, and Link fights the creature to seal it once again.
  The old woman tells Link to power up his sword with the three sacred flames, which will allow him to activate the Gate of Time in the Sealed Temple. <br><br> After many hardships, Link obtains the three sacred flames, turning the Goddess Sword into the Master Sword. <br><br> Using the Master Sword, Link attempts to activate the Gate of Time, but when he charges up his sword, the Imprisoned breaks free again. He seals the Imprisoned away once more. <br><br> Link then activates the Gate of Time and goes through. He emerges with the True Master Sword and the ability to obtain the Triforce.