Domain of the last Human.

    "Did I tell you that you look beautiful?", the black alicorn asked, staring at the white horse's form. It was dark in the cell, but the soft glow of her horn cast enough light to make out her features.

    "Flattery will not help you. Just answer the question. Who are you?" asked Celestia. The black alicorn was frustrating her. It had been half an hour since he had awakened. He had already driven an interrogator mad. They had to tie her down while she screamed about things of death and terror.

     The black alicorn had done nothing since but make small talk with Celestia.

    "You really are beautiful. Like a sculpture. Ed got that part right." the black alicorn commented again, an infuriating smile on his face. A mocking smile.

     Celestia snapped. Her mane and tail lit on fire, turning into white flames as hot as the sun. Her eyes exploded into twin shades of burning orange, miniature solar flares escaping and arching back inside, glowing like two majestic  suns. Every breath escaping her nostrils were hot flames as the air itself caught fire. Her body shone a bright blinding white as she asked the creature in an explosive voice .

     " Enough! This is your last chance, creature. Answer me! Who. Are. You?" she demanded. Finally, she would get some answers. Even the most battle-hardened warriors trembled in fear before her war form. When the 3rd Griffin king marched on Equestria , a glance of her visage had broken the entire army's morale. She expected a yell of surprise, a scream of terror, followed by the creature's unconditional cooperation.

    She had not expected laughter.

    It was the laugh of an amused creature.

    Her flames dimmed and died out as she returned to normal, still listening to sound of his chuckles as he struggled to control himself." I'm sorry, goddess,", he said, composing himself, " but you need to work on your form. Your are wasting to much energy to maintain that appearance." he said smiling."Well, I suppose I have been rude. Then again, you have done the same." he said, lifting all three hooves into the air, causing the huge chains to shift and clink, magic runes glowing on the steel.

    "You struck first! You had no reason to attack the Crystal Empire, or to injure the Element of Harmony, or to torture a little filly." Celestia screamed in frustration."You almost killed Spike!"

    "Now you're being unfair." the black alicorn countered, " I was a step away from death the first time, and your other goddess, she tried to burn me to death. With love. Who even does that? And, Oh yes,  I didn't 'torture' Applebloom, I saved her life. You can go see for yourself. Your bloody  'elements' of Order began to blast me instead of hearing me out . As for the Wrym, don't worry your divine little head about him, he cannot die. At all. Believe me, I have tried before." As he said this, the black alicorn got up, the chains not even slowing him down as they snapped. The magic runes sparked and fizzled out. An inky black darkness consumed his form, and where the black alicorn had just stood, there now stood a creature that even Celestia had only known through proxy. A human.

    She only had half a second to register the sight. Six feet tall, bipedal,  slightly musculed , a single arm as thick as the width her hooves and a face with a small nose and small eyes. He wore something on his waist covering his nether regions, and  nothing else. His right arm was completely missing, a scorch mark on the shoulder where it should have been. He had no fur.

    The half a second passed.

     Suddenly, faster than Celestia could react, a black dome sprung up around them both, as big as the cell, digging through the granite floor until there was no way out. There was no way out.  Reacting quickly, Celestia, charged a blast of energy, but some of the matter from the sphere dripped onto her horn like a liquid, and hardened, cutting her magic. Undaunted, she punched him with her fore-hoof. A hundred tons of pure physical force struck him square in the chest.

     He didn't even flinch. The amused smile never left his face.

     Celestia suddenly realised the futility of her situation. She had grossly underestimated her foe . His power, carefully hidden till then, flared, , and his aura briefly grew  a thousand fold before it retreated, folding back into his form again as he moved his hand and ever-so-gently pushed her unresistant hoof off. Celestia unceremoniously sat down,  fear clawing at her heart.

     He was still smiling. It was not the cold smile of a murderer or the psychotic smile of a madman. It was the smile of an ancient dragon, being challenged by a filly in oversized armor .

    Her face became impassive once again, but the human could still sense her fear, and he stopped smiling. He mentally kicked himself, and tried to fruitlessly repair the situation. Traumatizing the ruling Monarch was bad for business, after all.

     "Oh, I'm  sorry! I didn't mean to scare you. Well ... I did, but.... I assure you, I am as harmless as a fly." He sat down on a stool that emerged from the sphere.

      "Have a seat." he said, and a oval seat appeared around Celestia before  he could answer. It raised her until she was at the same eye level as the human. The fear in her eyes still remained, though her face was impassive .

       That did not bode well for the human.

     An idea struck the human. He bent down and clawed at the floor with his left hand, breaking of a piece of granite as large as his fist. He applied  a little pressure on it, and making sure that Celestia was watching, ground it into a thin powder with his fingers. He willed a blade to form from the Vibranium sphere, and used it to cut the vein on his left arm (purposefully wincing a little to show the goddess that he too could feel pain), letting a stream of blood flow into his palm before he healed the cut. He he mixed his blood and the white kneaded the resulting clay into a pink sphere , and cast a powerful spell on it. He held it out the resulting shiny pink stone to Celestia.

     "Here," he said "take this." . Seeing her questioning gaze ( still laced with fear), he explained -"It's blood magic, a very ancient and dangerous form magic. That spell was a life bond, and this little stone is now a bondsman's stone. You crush it, and I die.".

    " Then why would you give it to me?" Celestia asked, picking up the stone with her magic, "I could just kill you right now."she said ,studying the magic. Powerful tendrils of blood red magic were connecting him to the stone. She could not understand the spell itself, but  it seemed to be a set of sounds in an arcane language.The blood magic thing seemed genuine then. Suddenly, Celestia visibly relaxed in relief as her fear evaporated. The odds had flipped to her side. It was still a little confusing as to why he would literally hand over his life to an possibly hostile stranger.

     Then she realised it. It was a gamble. A well thought out one, but still a gamble. He knew that she would give her a chance to hear him out after this gesture. And since her fear was quelled, she would be able to listen to him with a calm mind. Which meant that he was confident with his explanation.

    "So ,what say? Deal?" the human said. He had already guessed what she was thinking.

     "Deal." She agreed.

     "Well then," the human said, smiling, I'll start with the first question."

     "I don't remember my real name........, but you can call me Dark Void."