AN: I don't own anything in this Harry Potter is owned by JK Rowling and the Avengers and any Characters from the Marvel universe belong to Marvel. The part in Italics at the beginning is directly from Harry Potter and The Deathly Hallows

"But then, Potter, Dumbledore as good as gave me the wand!" Voldemort's voice shook with malicious pleasure. "I stole the wand from its last master's tomb! I removed it against its last master's wishes! Its power is mine!"

"You still don't get it, Riddle, do you? Possessing the wand isn't enough! Holding it, using it, doesn't make it really yours. Didn't you listen to Ollivander? The wand chooses the wizard. … The Elder Wand recognized a new master before Dumbledore died, someone who never even laid a hand on it. The new master removed the wand from Dumbledore against his will, never realizing exactly what he had done, or that the world's most dangerous wand had given him its allegiance. …" Voldemort's chest rose and fell rapidly, and Harry could feel the curse coming, feel it building inside the wand pointed at his face.

"The true master of the Elder Wand was Draco Malfoy."

Blank shock showed in Voldemort's face for a moment, but then it was gone.

"But what does it matter?" he said softly. "Even if you are right, Potter, it makes no difference to you and me. You no longer have the phoenix wand: We duel on skill alone … and after I have killed you, I can attend to Draco Malfoy. …"

"But you're too late," said Harry. "You've missed your chance. I got there first. I overpowered Draco weeks ago. I took this wand from him."

Harry twitched the hawthorn wand, and he felt the eyes of everyone in the Hall upon it.

"So it all comes down to this, doesn't it?" whispered Harry. "Does the wand in your hand know its last master was Disarmed? Because if it does … I am the true master of the Elder Wand."

A red-gold glow burst suddenly across the enchanted sky above them as an edge of dazzling sun appeared over the sill of the nearest window. The light hit both of their faces at the same time, so that Voldemort's was suddenly a flaming blur. Harry heard the high voice shriek as he too yelled his best hope to the heavens, pointing Draco's wand:

"Avada Kedavra!"

"Expelliarmus!"

The bang was like a cannon blast, and the golden flames that erupted between them, at the dead center of the circle they had been treading, marked the point where the spells collided. Harry saw Voldemort's green jet meet his own spell, saw the Elder Wand fly high, dark against the sunrise, spinning across the enchanted ceiling like the head of Nagini, spinning through the air toward the master it would not kill, who had come to take full possession of it at last. And Harry, with the unerring skill of the Seeker, caught the wand in his free hand as Voldemort fell backward, arms splayed, the slit pupils of the scarlet eyes rolling upward. Tom Riddle hit the floor with a mundane finality, his body feeble and shrunken, the white hands empty, the snakelike face vacant and unknowing. Voldemort was dead, killed by his own rebounding curse, and Harry stood with two wands in his hand, staring down at his enemy's shell.

For Harry that took place two hundred years ago, though at the time he didn't realize it, but uniting the Hallows had unexpected consequences; he had become immortal. At first, nothing seemed different, but then as time passed, everyone except him started aging and growing older. Harry only began to realize what was going on when he came home from work one day and found the cloak stone and wand upon his bed. Picking them up, not sure how they got to his room, he attempted to get rid of them. Keeping the Cloak as intended, he returned the wand to Dumbledore's Tomb and threw the Stone into the ocean. Getting home there they were waiting for him on his bed again. After attempting several more times to get rid of the Hallows he eventually kept them, using the Elder wand as his own wand slowly stopped working, wearing the stone, and keeping the cloak in his pocket for emergencies.

Eventually it got to a point where he felt out of place, so he packed up his house, emptied out his vault, and proceeded to backpack across the world. Throughout his journey, Harry learned obscure spells known only to select tribes from countries that magic had long hidden away. While in North America, Harry learned to become an animagus from the Native American wizards who had perfected the technique over millenniums. Eventually returning to Britain, Harry was ready to end it and pass onto his next great adventure.

Breaking into the ministry of magic was child's play for him. His magic had become so much stronger over the past two hundred years that almost no ward could keep him unless he cast it. Heading down into the Department of Mysteries, he eventually reached the death chamber and stopped just before the Veil. He tilted his head and looked it over before proceeding to walk through the veil. Nothing felt different; the first sign that something wasn't going correctly. He just kept walking for what seemed like an eternity. Eventually he came upon a figure; he could feel the power emanating them.

The figure called out in a distinctly female voice, "Hello Master. I was beginning to think we would never meet." Confused, Harry approached her. "Who are you? I am no one's master." He heard the figure laugh as she turned around facing him. "I am Death and you are my master. You became that when you united the pieces of my core."

Seeing the confusion on his face, Death continued. "Your people called them the Hallows. You see, you live in what is probably one of million different dimensions. However, your dimension is the only one that harbors magic within each soul. Around the same time has the Three Brothers Antonich, Cadmus, and Ignotus crossed the river that had claimed millions of lives, someone in the original universe was in the process of preparing to destroy the multiverse. Until that point I had never interfered in mortal affairs; just continued doing my job taking the souls of the dead and helping them pass on. Every millennium or so, the multiverse collides as it is with one cosmic event that is set to happen at the same time across all universes. However, normally, the people combine with their alternate selves. A few people who don't exist in one universe or another, come into existence in what is the new prime universe. This time, there were two major differences in the collision.

Here she paused as if trying to collect her thoughts.

After a moment she continued. "Your universe was the first time any universe had so much variation from the prime. The other difference being that this collision created a being known as Thanos. Over time, he would become hellbent on achieving balance and attempting to win favor with me. Being Death affords me several skill sets and in this case I used the one that allows me to see any potential births across a universe. Knowing that your universe may hold the key, I looked over every path, every potential birth, and found you. One who would be born with untold potential for power, but also for doing the right thing. I saw you would need help."

Pausing once more, she studied him for a moment. "That was where I began my meddling. I needed to ensure you were born, but I also had to get you help so when the brothers crossed the bridge, I had my chance. Three souls who were supposed to die; the only ones I could safely interact with. I appeared to them offering gifts for the "Power and creativity". The oldest brother wanted a wand that would be unbeatable. I crafted with a bloodline curse so that it would only work properly for someone of his relation, but I also needed its power to grow so I added a compulsion that would make it continue to pass hands, absorbing the power of other wands until it reached you. The middle brother had just lost his wife and wanted to bring her back. This went against natural laws, but I allowed it. I added my own modifications; every hand it passed through if the wielder died, it would absorb its power to give to you once reaching your hand. The final brother asked for a way to hide from death, now his request fit in perfectly, as I modified the cloak so long as it was held by a direct descendent of the youngest brother your universe would be hidden from any and all collisions." With that she made a chair appear and sat down watching him process.

"So, this Thanos is dangerous, but why are you telling me all this? I died, I walked through the veil. There is no going back. If Thanos is in another universe, there's nothing I could do anyway."

Providing him with a chair, he sat down while Death explained. "Normally, yes there is nothing you could do, but there is one other thing I added to the gifts, knowing I had set the events in motion for you to one day get them. I made it so once you did, you would be my master with powers equal to mine... including the ability to move through dimensions. Additionally, you are unable to die until you have completed your destiny. The only one with more power than me is my older sister Fate. She wouldn't allow me to interfere like that unless it needed to happen as part of her plan. Around five hundred years ago, I met with her and she explained to me that the multiverse was never supposed to exist. when the next collision happens that's it, but the only way that can happen is with a driving force that can make sure events play out properly and when she saw you she knew your mindset would assist wonderfully."

Harry stared for a second unsure of at what before swallowing. "I'll do it." Death smiled "Perfect, there is one catch however. In order for Fate to allow us this conversation I have to lock it away within your subconscious. Until the time is right, you cannot remember any of this." Harry nodded before standing up. "Well then lock it away and send me there. I will just be myself and hope I am doing the right thing."

Death stood up vanishing the chairs. "When you arrive, you will have your backpack with your belongings and your gold. I will place you in the exact place you need to be to do the most good. You will retain all your magic with one slight change; I am going to merge the Hallows with you, allowing you full access to your magic at all times." Nodding, he turned as a door appeared. Gesturing to the door, Death explained "When you step through that door this conversation will be locked away. The only thing you'll remember is you performed a ritual in your old world which combined the Hallows with yourself to end the bloody history behind them and then waking up there after walking through veil."

Sensing she was finished Harry approached the door, grasped the handle and stepped through. As he did, one thought passed through his mind

I guess this is truly going to be my next great Adventure.

After Harry stepped through the door Death vanished. She reappeared next to another figure.

"You were right, sister. He went along with it. Hopefully with his help we can repair the damage our brother caused." Turning, Fate studied Death but for a moment. "There is a reason mortals are not supposed to know about us. If this Thanos manages his plan, it will destroy not only half of all life in his universe, but in every universe. The Infinity stones are linked to the very existence of the Multiverse, always residing in the prime universe. If used as he intends then it will be the end times."

Death nodded. "Those stones are all that are left behind from father each representing part of his power. What the mortals call the big bang was him bringing the multiverse into creation, however, the effort tore him apart. He knew the stones would be brought into being from what was left of his power. He created us three beings to watch over Fate, Death, and Life, what he didn't predict however was Life falling in love and revealing our existence putting everything in jeopardy. I just hope this plan works because if it doesn't, then all will be lost."

Fate nodded "It will sister, I have foreseen many variations of this plan with many different people from many different universes and for whatever reason that universe came into existence with beings able to draw upon Father's domain. It has to mean something, and that one particular mortal is the only one who was able to come close to preventing the end. He was just barely strong enough before you stepped in. Hopefully it will be enough, and that team could use some magical assistance as well."

AN: Decided to try my hand at writing a crossover. Let me know what you think