A/N: I'm back! With a new story to boot...haven't updated my other stories due to reasons, but now my creativity has peaked again and I just had to write this piece! There are some great Harry Potter/ Mass Effect crossover stories out there, but I wanted to write one myself; although, if I finish this story, I plan to have Harry travel to another universe.

Well, enough boring notes – enjoy reading!

"Usual white dream, I saw it there; I forgot what I saw. White cloud I saw a little while ago. What is it? Where is it? And...no sounds, no sounds. There is nothing, it doesn't reach in there, the place there. I was in there a little while ago. Is it wrong?"

- Gallhammer, Delirium Daydream

When Harry closed his eyes for the last time, he was content. He had lived a happy life, up to the ripe age of 152 years. After his retirement as Head of the Department of Magical Law Enforcement he enjoyed staying at home with his wife Ginny, spoiling his grandchildren and grand-grandchildren. He had outlived Ginny by only a few months and – despite loving his life – he had been looking forward to meeting the rest of his family in the afterlife.

When he opened his eyes, he found himself once again standing in the bright simulacrum of King's Cross. Looking around, he saw the train in a haze of steam, ready for departure; the door of the wagon open, waiting for him to board the train. Elated he began to climb the stairs, when he heard a gravely voice behind him.

"Master."

"Oh bugger."

Harry turned around and saw a being he could only describe as the Grim Reaper; wrapped in a black cloak, face obscured under the hood, carrying a scythe. The Reaper stared back at him, dim points of light under the hood fixed on his face.

"Master.", repeated the Grim Reaper.

"Death.", said Harry in lieu of a greeting, unsure what to say at all.

"That I am.", confirmed the Reaper. "Or, to be precise, I'm an avatar of Death, a shell so you can see me, but this is neither here nor there."

"Yes, well...", said Harry awkwardly. "What is it that you want from me? You are calling me Master, although I am pretty sure that I disposed of the Hallows – well, the Elder Wand and the Resurrection Stone."

"You did; nevertheless, having carried all three at the same time, even for only a moment, did make you my master.", said Death.

"Great.", muttered Harry. "The infamous Potter Luck carries on even after dying."

"It doesn't.", said Death. "I should have visited you while you were still alive. However, you were quite the conundrum; aside from being the first one to achieve the title 'Master of Death', you were also the only one to willingly cast aside the power at your disposal. An invincible wand, a stone capable of calling souls to the plane of the living...you would have been the most powerful wizard alive. Despite this, you decided on a quite life. Admirable, I say."

"It was the one thing I always wanted. Peace, that is.", Harry answered honestly.

"And this is why I let you live your life to the fullest. However, now that you are dead, you have to fulfill your role as my Master.", said Death. "Still, once again I will grant you a boon: you might not be able to truly pass on, but I will let you see your loved ones from time to time."

"Thanks, I guess.", said Harry. After a short pause he continued: "Wait, what do you mean 'fulfill your role' and 'not being able to pass on'?"

"The title 'Master of Death' is a powerful one, and with great power comes great responsibility.", recited Death. "At least, that's what I would say to a lesser wizard than you. Truth is, being Death is a nastily exhausting task; thus, I used the three hallows to create the legend of the Master of Death."

Harry blinked. He didn't expect that.

"You created the legend so someone would unite the hallows to...take your job?", he said slowly.

"Heavens, no!", exclaimed Death. "No, being me isn't something a human – or anyone mortal – could do or even comprehend. No, the Master of Death has the glorious task of lessening my workload by reducing the numbers of souls to reap. In a nutshell, saving the world."

Harry groaned.

"You want me to save the world? Again?!"

Death chuckled. "No, no...not this world. Other worlds. Other universes, even."

"I refuse.", said Harry flatly.

"You can't.", responded Death.

"Doesn't matter. I refuse. Once was enough."

"If you don't save the world, billions will die a horrific death!"

"Find someone else to do it."

"I can't!", exclaimed Death. "I mean, sure, someone was chosen to save the universe, but he will fail, or at least the universe will fall into disarray."

Harry defiantly glared at Death. After a short, pregnant pause Death sighed.

"Look, I'll make you a deal. You'll hear me out and then you can decide."

"...fine", conceded Harry.

"There is an universe without magic; humanity has reached the stars, explored the galaxy and met with aliens. Stuff happened, and now they're facing destruction.", said Death.

"That's not an explanation. It's not even a brief summary.", rebuked Harry.

"Alright, alright. In the twenty-first and twenty-second century humanity was united into one global government and started colonizing the solar system. After uncovering ancient ruins on Mars, left by a species called the Protheans, they discovered something called a Mass Relay – giant contraptions used to travel great distances between star systems. After meeting an alien race called Turians, they waged the battle of Shanxi, which humanity lost. Nevertheless, they were included in the galactic community, led by the races of Salarians, Asari and Turians. The council, which decides in superseding matters, is located on the Citadel, a giant space station. However, a new threat is starting to rise, unknown to everyone. Beings called Reapers are about to invade the galaxy and eradicate all life.", explained Death in full. "As you can see, the situation is pretty dire."

"Right. So, suppose I decide to help you out, what do you want me to do?", asked Harry intrigued.

"Well, firstly, you can spend some time with your family and friends; time doesn't matter here. But eventually, you would have to travel to this universe. Your job would not be to stop the Reapers; it's tedious, dangerous and there is already someone chosen to do that. You will support Jane Shepard – the one chosen to defeat the Reapers – and do some...odd jobs on the side. Of course, you won't do this alone. I'll send you help, and you will find friends to lessen your burden."

"...I don't like it. However, I can't let someone else do it all alone.", sighed Harry. "Alright, I'll do it. Now, where is everyone?"

Death chuckled and changed his form to a train conductor. "I hope you didn't forget your ticket. Board the train and off we go!"

After an eternity with his loved ones, Harry felt a strange pull in his chest. Instinctively recognizing it as a summon, he said his goodbyes and was transported to the "Station in the void", as he had started calling the limbo version of King's Cross.

"It's time.", said Death. "In a few moments you will depart and travel to another universe. These two shall be your companions: Taxidermy and the ghost of Siegmund Freud."

"What.", said Harry flatly, looking at a ghost and a...thing in a suit.

"Well, this is the ghost of Siegmund Freud-", said Death.

"Yes, that's rather obvious.", interrupted Harry. "But what's that?!"

He pointed at the being called Taxidermy. It hat a humanoid body, though his hands resembled claws. His head – if one could call it that – was something stitched together. It looked like a deer's head with a beak; the sclera and pupil were pure black, the pupils an ominous red.

"He's Taxidermy!", said Death merrily. "He is a pretty nice being."

Harry looked incredulously from Death to Taxidermy and back. Deciding to let the matter go for now, he sighed.

"I'll bite. So, what now? Any hints what I should do?", he asked Death.

"Of course, of course. I will grant you the knowledge of the races living in this universe, how to use the technology...everything you would know if you'd been born into this world. You won't have your magic (A/N edit: he regains it in later chapters, so please stop mentioning it in the reviews); instead you'll be able to use something called biotics. I will transfer you to the Citadel. There you'll start your journey. Of course, I will also provide you with funds and the like, everything you need to survive."

"Sounds...promising.", said Harry. "Let's go."

A/N: Taxidermy is a character from the show "Lenore". The ticket refers to the one Harry got with his Hogwarts letter (it was never used, so maybe it was for the last ride).