𝚆𝙸𝙻𝙳 𝙲𝙰𝚁𝙳 ~ Killua x Reader

𝙵𝚕𝚊𝚜𝚑𝚋𝚊𝚌𝚔 𝚡 𝚘𝚏 𝚡 𝚊 𝚡 𝚂𝚙𝚒𝚍𝚎𝚛 ~ Chapter 0

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Today you were taking the Hunter Exam. You thought back to when you first learned nen...

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Where's Hisoka..? I need to find him... I have a bad feeling... There!  You see Hisoka a ways away. he seemed dazed and was moving slowly. "Onii-san? Are you alri-!" you began, though he threw a punch that threw you hundreds of feet back. You hit your head, your consciousness fading. Your vision faded as Hisoka walked over to you. A substance feeling flowed from all around you, and you blacked out. 

"Damn. Now the fruit won't ripen, as I... hm?" Hisoka spoke. He touched your neck, feeling for a pulse. He began to chuckle, "Oh Y/N~ You never fail to amaze me! Looks like I'll have to find someone to teach you nen. I could do it myself but... I don't think I could hold back~ I wouldn't wanna soil the fruit that has grown, immature yet sweet..." he rambled, "Looks like you won't be lying at 9 years old, nee-chan!" 

three months later............

"...an? I told you they would wake up." Hearing the sound of the magician's voice made you jerk up. Looking down, you noticed bandages on you, presumably from the scars his bloodlust-filled punch left. To your left, you saw a man with a peculiar skull mask and dark hair. He looked at you, informing, "I teach you nen. Hisoka annoying and he say he leave me alone if I teach." You tilted your head. "Nen?" you asked, "What's that..?" He raised an eyebrow. "Too many questions. Shut up. I teach you starting ten minutes from now. Be ready or die." he spat, walking away with his hands in his pockets. The moonlight shone on your s/t (skin tone ex: pale, dark, tan, etc.) face, making your e/c eyes seemingly glow. "Who.. was?" you asked. Hisoka smiled strangely and said, "Feitan, a part of the spider~!" You sighed and asked, "What... happened?" He looked into your eyes. "A miraculous occasion, you were attacked by both a powerful punch and hostile Ren all at once! An average, less amazing person would have been killed by it, but you~ oh! My little wild card, always surprising me! It forced open your aura nodes and seemingly increased your... amazing potential! You have so much potential~ But don't disappoint me, nee-chan. Your training is starting, see you!"

You approached Feitan, he clearly didn't want to wait for you, as he lifted you onto his back and ran at an insane speed. You couldn't even hear the sound until you stopped many miles away. "Your name." he demanded. You answered without hesitation, "Y/N." It didn't take more than an hour for you to collapse from tiredness. "Get up. Stupid." Feitan growled. You protested, "We've been running really fast! I-" "We run faster if you don't shut up." he spoke sternly, "Now I go that way. After 45 seconds, I already run 11 miles. Then you start. If you don't catch up in 10 minutes, I kill you." After 45 seconds, you ran as fast as you could, the wind blowing rapidly and loudly through your ears. There were ten seconds left. You fell to the ground at Feitan's feet. "Now we do this over and over as endurance training." he instructed. "Huah!?" you whined.

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Reflexes practice, meditation, swordfighting, and more were finally done. He grabbed your hand. he pulled a seal off that was to "force Zetsu" to make sure you wouldn't pass out. Aura flowed out from you. "You learn Ten. Imagine aura flowing around you. Stand natural." he explained. You shut your eyes and focused. "Good. Now maintain it. Practice Ten and Meditation until next week and I teach more. You don't improve? I kill you." he threatened. The week passed quickly and after inspecting your progress, he spoke, "We do Ren and Gyo today. Then if time, we do Zetsu if time. Make aura burst. Then make it go to eyes. There. Good. Now we do Zetsu." You sighed, tired already. He told you, "Make nodes close." You learned this quicky, and were instructed yet again to practice or die. This week ended. The next week, you ended up with a glass and a leaf. "Nen has six category. Enhancer make thing or self stronger. Transmuter change quality of aura. Emitter detach aura. Manipulator control thing whether living or nonliving with aura. Conjurer manifest. Specialist unique." he taught, "Use aura on glass to determine category. You did so and the leaf began to replicate, morphing into a white rose, the water all gone. "You specialist." he said, "Now we find your Hatsu." He tilted his head, asking "Any fixations you good with?" You shrugged, "Gardening, I guess."