The Witcher hunt ( T.W.H )

This is a fictional story, this story is not historically accurate, but they are some references from historical events, please enjoy. In the middle of the city, a massive summon circle appears covering the whole city; and a demon appears demanding to see 10 of the strongest witch hunters from 5 to 10 years old. Looking at the 10 boys, one was selected. "One wish, you have one wish." The demon says, pointing to the 10-year-old boy. "Come on boy, you can bring the end of the world, or maybe you can become a god." The devil says with a smile on his face, laughing that the lives of all the human race are in the hands of a child. "I see..." The boy says grabbing his chin "you will be my pet?... yeah... yeah! You will be my pet." The boy said, pointing at the demon. The demon started to laugh. "Good, you are going to need me for the place you are going." the devil said smiling, and looking at the kid with fully open eyes, that put chills inside anybody that was looking at the eyes of the demon. But the kid was trying to be strong at the demon sight. "Where am I going?" he says. "Oh by the way, if you look at your open hand a menu will pop out." The demon says. The boy looks at his hand and a menu, like a menu of a game appears. "Basically, whatever you kill is going to give you XP, you can level up your abilities with that XP. You can kill magical animals, but what gives you the most XP is the witches, but the witches have levels as well the highest level a witch can have is level 100 andddd... that is it  for the basics, but you can do more than what I explain." The demon explain`to the boy. After that, a voice of a man suddenly fills the street "Hunters!.... Hunters!.... we need witch Hunters!" Everyone looks at each other, then the demon looks at the people and and then at the boy, then the demon smiles and says "this boy will kill the witches." and the demon points at me. Nobody had the time to respond to that statement because an enormous fireball was coming closer to the city. My body moved in response to that, my body jumped up, after I jumped, I looked down and saw I was above a 30-story building, flying  in the air. The demon teleported next to me and said "Listen kid there are at least 30 witches in that fireball and I have a bit of time to spare, so I'm going to explain" the demon clears her throat "let's see, there are many elements, like... water, fire, earth, air umm... that is all that I know, but if you think of that specific element, umm... you can use it. And that is the explanation, good luck" the demon disappears after saying that. "That is one useless demon" I say while crossing my arms" well I can't say that it didn't help. Okay...think think water? Water bla... [water blast!]" as I said that, I pointed my open hand at the fireball and I created water from nowhere, the water flew from my hand to the fireball at a high speed. "Cool." I said looking at my hand, but then I felt dizzy. "Oh, yeah that." The demon said, sounding more like a woman. "The price of that power is [blood], but don't worry if you are in contact with the element that you are trying to use, you are not going to need your blood, fun thing right?"the demon says. "No," I say. "And by the way, are you a woman? And where are you?" I asked, but the demon didn't have time to answer because the witches started to throw fireballs at me. I started to move my hands, creating air walls to stop the fireballs. "Air?...control?... yeah sounds good. [air control]" after stopping the fireballs, I landed on the rooftop of the building. I stomped on the roof  and a piece of concrete came out of the building, with a fast pace I shot five of them at the big fireball creating an opening letting me see... "umm demon, what ever you are call there are women that have the face of and old woman, and a body of like a 20-30 year old woman's?" I ask the demon. "That is the price that the witches have to pay, but for you my lovely boy, for you, it's free of charges except for the blood." The demon says. "Let's have some fun with your new powers, come on try punching the rocks, don't worry it's not going to hurt." I punch the piece of concrete, and it breaks into tiny pieces. 'Now, throw them!"the demon says I open my hand and push the floating pieces of rocks, then the pieces of rock fly through the air and hit one of the witches. "Look at the XP you are talking about." I say, looking at the menu. "WHAT?! It can't be," the demon says. " It says that I'm level 1, and I need 1000 XP to level up, cool this is like a real game." I say, with a smile. "But it says that I got 10 XP?." I ask her "This is the first time that I've seen someone kill a witch," the demon says, surprised by the young boy. "Then, what does the witch hunter association do?" the boy asks. "They vanquish the witches, they don't kill them." The demon answers. "I see" I say to the demon, then I yell at the witches "WITCHES, IF YOU LEAVE NOW, I WILL SPARE YOUR LIFE." A witch parts from the rest. "Or what little boy, are you going to burn us alive?" "HAHA funny" I stomped the ground and shot a chunk of concrete at the witch, and made a hole in her body. "I'm going to kill you with rocks, It is more ecological like this." I say, while the witch bleeds out in the ground. Then I yell at the witches one more time." I WILL GIVE YOU 10 MINUTES TO THINK ABOUT IT." Then I sat down to meditate. "What are you doing?" The demon asks. "I'm thinking... of how I'm going to kill all these witches," I say. "How about.... you level up your abilities?"The demon asks. "I guess I could see how does this work" I look at my hand and look at the abilities that I could buy "look this one is call [cross of hell]" "And it's only 30 XP, buy it". The demon says. "Yeah, now I'm back at 0 XP, am I going to be able to reach level two some day?." I ask. "Well...." the demon says, but I stop her before she finishes. 10 minutes pass "So I guess they are not leaving" I say "I GUESS I'LL KILL YOU ALL NOW" I yell at the witches. "Just do it, I want to see some fireworks." the demon says.