Time: Shortly after the events that occurred in Dark Empire I
 

Majestically it stood. High a top one of the largest mountains in all of Coruscant, it reached for the clouds both above and below it. For most it was a myth, a tale to frighten children. But the few who knew otherwise wished they didn’t.
Darth Vader’s castle.
It’s massive black cathedral like structure seeming to be watching over the bustling streets and nightlife of Monument Square below it.
And inside that castle, stalking about in his father’s black robes, with all the power in the universe at his fingertips was Luke Skywalker. He was hero of the Rebellion, slayer of the Emperor and Darth Vader, - and he was here to hide.
Yet, over the past few months, staying in this dark, yet oddly familiar place, he tried to convince himself that he was merely here to rest and recuperate from his recent ordeals.  He had even told himself that the Force had guided him here to search for clues to the secrets of the Jedi’s lost ways.
So to keep his word, if only to himself, and to pass the time, he had indeed looked through his father’s castle. It gave him something to do, to feel as if he were doing something purely good, without having to worry about the consequences of his actions, the consequences of using the Force. He had been through the entire castle several times now, searching for something; anything, that would lead him to some type of deeper understanding of the Force. Surely, all records of the Jedi couldn’t have been destroyed. But searching with and without the Force had proven fruitless, and Luke was becoming more and more frustrated. Yes, there had been a few secret passages leading to hidden meditation chambers and training areas, but other than those glimpses into how a Jedi – or Sith, might become trained, the castle appeared to hold no answers.
And after a while he decided to give up the apparently fruitless effort, instead focusing his energies on finding some traces of who his father been.
However, if this castle revealed little about the ways of the Force, it revealed even less about Darth Vader, and who he was when he wasn’t under the watchful eye of the Emperor, or executing his black will. To say the castle was sparse would have been understating the matter considerably. No decorations adorned the walls, and the chairs and tables were all made from similar, basic wood and metals. There was no indication of the wealth Luke knew that Vader commanded, no indication that he was anything other a man seemingly renting a large amount of space and the privacy that came with it.
So finally, frustrated once more, he had to admit defeat, give up all the pretenses and excuses, and admit to himself that he, Luke Skywalker, Jedi Master, had come here to run away.
Through an antechamber and out onto a terrace that provided a particularly spectacular view of the bright lights of the city below, Luke stood, hands gripping the railing as the bitter wind racked through his hair, blowing his capes wildly around him. Briefly, he wondered how many times his father had come to this terrace, how many times he had gazed down to the city below and contemplated who he was, and what he had become.
We really aren’t that different after all. Luke thought, for he realized he wasn’t unique in his struggles; his horrific journey through the darkside had at least taught him that much.  But somehow knowing that he had survived where so many others, even his own father, had failed before him; that he was one of the very few Jedi that had become corrupted by the dark side, and returned, lent him no comfort at all. Maybe he should have taken some pride in his growing strength in the Force, but tonight, all he felt was alone.
“Hurdle you have you overcome, yes, stronger now you are, but many tests will follow.”
Even if the Force hadn’t been so strong in Luke, and even if the being near the entrance of the terrace hadn’t bathed everything in a blue light, Luke could have never forgotten that voice, or the odd way it’s teachings were spoken.
“Still, I sense much anger and confusion in you,” the voice continued, as it came across the terrace.
Luke managed to conceal his bewilderment at the unexpected appearance, before he turned to face the glowing spirit.
“Master Yoda,” Luke said, as he inclined his head slightly in respect for his former master.
Yoda returned the nod.
“Still, much to learn of the Force have you.” Yoda admonished, his tone taking a stern teacher’s edge.
Luke’s surprise at seeing his former master quickly turned to annoyance. How dare Yoda now decide to appear before him, and point out his shortcomings. After all, Luke thought, this was the same teacher that died when he was needed most, that was absent for all of Luke’s trials, and all of his his pain and suffering. Maybe he should be happy for the company, maybe he should have been grateful for the opportunity to ask questions that were always foremost in his mind.
But all Luke felt was betrayed, and angry.
Yoda seemed to sense his turmoil, but said nothing as Luke wrestled to keep his anger in check.
Luke stood for a time, not speaking, or even meeting Yoda’s eyes. He was digesting the past few moments, allowing his feelings of anger and betrayal to churn out their fury inside him before he spoke.
“Why have you come?” Luke asked finally.
“Summoned me you did.”
Luke couldn’t resist. “Summoned you? – What about all the times I needed your guidance over the years. What of all the hardships I have endured alone, the suffering that comes with being a Jedi. When I needed to tell of the pain only you or Ben could understand. All those times I called out for a mentor, a friend? - No, I didn’t summon you tonight.”
“Some things must be worked out in Jedi’s own body, own mind.” Yoda said, in a maddeningly calm voice.
 Luke’s anger grew. How dare Yoda just reappear into his life after all this time, and attempt to pick up his teaching where he left off. He didn’t need anymore lessons from Yoda. He’d lived a lifetime of pain without any help from anyone. He’d made his mistakes, but he was stronger now. He could do it without the help of his former Master popping in and out of his life whenever he felt like it.
Luke spoke while still angry. “Well maybe if you had prepared me better, given me more complete instructions, in the ways of the Jedi, I wouldn’t have had all of these problems. But as you can see, I survived, without your help.”
Luke turned his back on Yoda, his anger seemed like a tornado inside of him.
The air seemed to still all around them. The normal buzz of the city died into quiet obscurity.
Into this silence, Yoda spoke.
“Not a perfect teacher was I. Mistake’s even Master’s make at times.”
Luke turned; brow furrowed in disbelief, but said nothing.
Yoda continued. “Taught you what you needed to succeed. If you had come to me earlier – if you had stayed longer, more complete would your training have been.  Much was left undone.”
Luke’s mouth hung open slightly. He stared at Yoda disbelieving what he was hearing.
Time seemed to slow. Overhead, a fog crept down from the top of the mountain.
Yoda again spoke. “Many truths not yet revealed to you. Patience, in time you will acquire the knowledge.”
Finally, Luke found his tongue. His throat felt dry. “But at what cost?”
“Necessary to erase mistakes of the past. Necessary to fight injustice in the future. Best hope for the galaxy you were.”
Yoda was right, of course. And Luke felt ashamed for his accusations. For in his deepest heart, he knew how much the Galaxy had needed him.
He couldn’t meet his Master’s eyes.
“On your shoulders hang the lives of many. Serve them best up in this castle, alone, you do not.”
Luke spoke to the floor. “But I’m so tired, Master.”
Yoda’s eyes closed slightly. “Greater good you serve.  For the power you have to help many. Struggle, yes you do, with a life not truly you own. Many Jedi have walked this path.”
“Yes, I have all this power,” Luke said in defense. “But it separates me from those I love. Evil grows everyday. Atrocities happen, and I don’t even know about them. I eliminate a problem, only to have two more arise. I’m the most powerful person in the galaxy, but I can’t do anything, really.”
In a small voice Luke added. “And I’m so alone.”
Yoda drew himself up to his full height and shook his head slightly, his ears catching Luke’s peripheral vision. His voice grew very stern, “No, not alone, only alone because you choose to be. Friends you have, sister you have. Take comfort in them you do not.”
“But I’m different.” Luke insisted.
“Different yes, but not reasons you make yourself believe.”
“What then?” Luke said, a touch annoyed.
“Afraid you are.” Yoda said simply.
“Afraid. Afraid of what? I have powers they will never have.”
“Who are you asking, hmmm?” Yoda said, his ears coming up inquisitively.
Luke turned his back to Yoda again, this time not in anger however, but in thought.
Luke closed his eyes. Relaxed, he let the turmoil inside him evaporates until nothing was left but the answer. The naked, painful truth.
Luke spoke to himself at first, then faced Yoda. “I’m afraid, afraid they’ll leave me like you did, like Aunt Beru, like Ben. And if they leave me, I will be alone. Alone… like my father…”
“Maybe, it’s better to have loved and lost? Hmmmm.”
And with that Yoda vanished.
“Wait!” Luke called reflexively into the void, all the while knowing Yoda wouldn’t return.

For a long time Luke stood over the terrace, looking, but not seeing the city below. All around him, Coruscant had seemed to return to its normal buzz of life and lights, but Luke took little notice. Instead he was lost in the thoughts and revelations that had come with this night.
The cool mountain air seemed to cleanse the turmoil from him, to whisk away the foolishness from his soul.
Sometimes just when you think you’ve got some things figured out.
Finally, a small smile touched his lips, and he chuckled to himself; for he realized that even Jedi Masters can get lost along the way. But now he knew that the Force would always guide him, in one way or another. Walking back in from the terrace and into the castle itself, Luke gathered up his few belongings, and took one last look around at a legacy. His father’s legacy, - not his.
And with that, Luke walked out of the castle, sealing the doors behind him.

The thick fog that had been creeping down the mountain earlier rolled in completely, later that night. A fog so dense it covered and hid Lord Vader’s entire castle.
The fog never evaporated.
And in time most of the residents began to question whether there really was a castle there at all.
And in time, it was forgotten.