(It was too long so I had to split it into two.)
He suggests that Link return to Clereve Peak, where the spirits of previous Dream Sages supposedly reside, to seek guidance from them. They give him a cryptic message - "The girl and the flute shall guide the way." Link consults Zelda, who tells him that she did recently, supposedly by coincidence, have a dream of a strange door opening before her. So Link takes her to the Entrance to Terror, where she plays the flute, causing the door to open. Link enters and soon finds himself in a vast circular chamber, where he is once more confronted by Azril, who seems to be under the control of the corrupted Sceptre. Link defeats Azril a second time, and the Sceptre takes full control, growing itself into a huge immobile beast which uses Azril as a sort of host. Link defeats this, but then a circular hole in the middle of the floor opens, and Azril is dragged into it. Link obviously follows, finding himself submerged and floating in what seems to be infinite darkness. He is surrounded by eyes resembling the one on the Sceptre, and soon an amorphous form appears to him, telling Link of how it has been trapped here for centuries, invading the minds of sleeping humans, trying to search for one to become its servant - an opportunity he found in Azril, who was not only young, weak and inexperienced, but also bore the title of Dream Sage and the power of the Sceptre, which it managed to corrupt, using it to control Azril directly. When all is said and done, it begins to gain a humanoid form, revealing itself to be the Sealed True Nightmare, Ganondorf (Of course). Link defeats him after a long battle, but also passes out himself, waking by the altar where he originally found the Flute along with Azril. They return to the village, and, as you put it, all is well once more.
Yeah, I didn't intend to write that much. Sorry to bore you. Also, some bits of it aren't as well thought-out as I remembered. Ah well. I also apologise for any typos I may have, erm, typoed.