AN: I do not own Harry Potter or Attack on Titan.

(Hogwarts School of Witchcraft and Wizardry-The Chamber of Secrets-2852)

Everyone else was gone, the planet had erupted into another world war in 2748 which ravaged the planet leaving it lifeless, only one creature still remained on this desolate world, the immortal, unkillable, Master of Death, he was once known by another name, Hadrian James Potter-Black.

Hadrian looked along the chamber he had called his home for the last 700 years and sighed "It's time" he walked over to the ritual circle, it was designed to turn him into an orb that would travel dimensions until it found the one he needed to be in most, he whispered "Send me to the one I am needed in, to the person who needs me the most, to a person I can love, even if it is only platonically" he then kneeled, all of his possessions placed in a shrunken truck in his pocket and began to chant.

"Send amin away, e' i' form en' an orb, utua i' yamen' amin naa ante most, send amin a' i' er ya anta amin protection, sina naa amin plea". His body was transformed into a green orb, it then formed a blue portal and flew into it. The orb flew for centuries scouring each dimension until it found the one it needed, it scanned the basics of the dimension and transferred the information into its host's consciousness, it then retained a unique ability form this dimension and transferred it to its hosts before falling into the earth, waiting to be found by the one who would need its host.

It sat there for almost 50 years before finally its host appeared. Historia Reiss was digging to plant new seeds, when she felt her spade it something hard, she looked at it and noticed its unusual emerald colour, she quickly dug it out and gasped, in her hand was an emerald green orb, not unlike those used by soothsayers in her story books. She looked over it carefully and noticed the unusual design of a triangle with a circle inside of it with a line through the centre, she then gasped as it shrunk to pendent size and a chain formed out of it, she quickly placed it around her neck hiding the chain and got back to work.

The pendent orb flashed happily as it had finally found the host necessary, it did a quick mind read as to catch up before transferring the information to its host and waking him up.

(Harry's mindscape)

Harry yawned as he woke, he looked around and realised that this was his mindscape "So, I'm still here" he looked at the date "And it has been fifty years, I wonder why I was woken" he walked to his library and noticed a few more tomes were there, he quickly absorbed the new information "Historia, hum, let's go see" he then created an image of himself that could do all the things he could do but could only be seen by Historia.

(Real World)

Historia sighed as she worked wonder why her family hated her when she heard an unfamiliar voice from behind her "oh wow, you are young" she turned quickly to see a young man with mid-length black hair, wired glasses, a wiry but toned figure and emerald green eyes looking at her, he looked to be about 18 years old and was smiling at her with an emotion she generally didn't experience all that much, kindness.

She tilted her head as she watched him, he smirked and did the same, she blinked at him and he blinked at her. She smiled slightly and stuck her tongue out at him for a moment before pulling it back into her mouth, he did the same and then grinned "Having fun little one?" she blinked and nodded hesitantly, Harry smiled sadly and rubbed her cheek with his hand, she flinched before noticing that he wasn't hurting her, she rubbed back against the hand.

Harry frowned at the reaction remembering his own childhood, he leaned down and kissed her on the head, she looked up startled at the action, he grinned "I'll always protect you little one" she grinned back hesitantly "How do I find you?" Harry moved his hand and brought up the pendent orb "Hold this tightly and wish for me" she nodded "I'm Historia Reiss" "King Hadrian James Potter-Black, Lord of the Most Ancient and Noble Houses of Potter, Black, Peverell, Gryffindor, Slytherin and Emerys, Lord of the Most Ancient, Noble and Powerful House of Windsor, Duke of North Hampshire, and adopted son of Queen Elizabeth of England, at your service".

Historia gasped and bowed "My Prince" he shook his head and lifted hers "You have no need to bow to me young one, I have seen your life and I will no longer allow this atrocity to continue, so I shall be your guardian angel, as only you can see and touch me, but I can touch everything in this world" tear prickled in her eyes "How? Why?" Harry smiled at her "Because you my dear, no matter your birth are a princess, or at least a noble, you should not be treated this way".

Historia looked at the pendent "So what is this?" Harry grinned "That is me, a psychical form of my existence, you see I am not from this dimension, I arrived her fifty years ago in the form of that orb, before that I was a wizard in my original dimension, and I was the last being alive on my planet, you see, the humans on my planet were fighting each other in a massive world war, they fired weapons that destroyed the lands, making them uninhabitable and slowly but surely, they all died out".

Historia blinked "But you didn't" Harry shook his head "No, when I hit 18 years old something happened to me, something that made me more than human, I couldn't age and I couldn't die, that was…" Harry concentrated really hard trying to remember how old he was "I think, around 850 years ago" Historia blinked "That's a really long time" Harry nodded "Now, the best way for me to protect you is to take you in as a ward, this gives me permission to destroy the lives of anyone who hurts you".

Historia's eyes widened "How and why would you do that?" Harry smiled at her "The why is simple, you need someone in your life who will protect you and the how, simple, like this, I King Hadrian James Potter-Black, Lord of the Most Ancient and Noble Houses of Potter, Black, Peverell, Gryffindor, Slytherin and Emerys, Lord of the Most Ancient, Noble and Powerful House of Windsor, Duke of North Hampshire, and adopted son of Queen Elizabeth of England do take one Historia Reiss as a ward of Houses Potter, Black, Peverell, Gryffindor, Slytherin, Emerys and Windsor until she is of age, so mote be it" Historia whispered with tears in her eyes "So mote be it" a flash of golden light circled them before disapating.

Harry grinned at her look of awe and ruffled her hair "Don't you worry your pretty little head about anything Tori, I've got you" she giggled and from that point on for the next five years, anyone who bullied or berated Historia, had their lives completely destroyed and were generally left on the streets or placed in prison for some crime. During these five years, Historia finally bucked up the courage to tell Hadrian that she was going to join the military, he nodded and told her that he'd be with her every step of the way.

It wasn't long after that Historia, who had already run away from home and hid under the name Krista Lenz bumped into her first flesh and blood friend, the girl seemed a year or two older than her and was blunt and Cynical, not unlike Hadrian when he ranted about most of humanity, they quickly formed a friendship and joined the cadet core together, with Hadrian watching over them, that was 3 years ago.

AN: Translation:

Send amin away, e' i' form en' an orb, utua i' yamen' amin naa ante most, send amin a' i' er ya anta amin protection, sina naa amin plea

Translated-Send me away, in the form of an orb, find the place I am needed most, send me to the one who needs my protection, this is my plea.