When Levin saw his Family die in front of him he awakend his power in rage which shifted the balance of battle he slaughtered every monster he saw in front of him because after he awakened his power boosted dramatically he destroyed everything in his way like a hungry predator , right now levin was only eight years old . After killing all the monsters he screamed and cried so loud that he almost lost his voice carrying the bodies of his father,mother and sister, his whole world got destroyed in less than a day and he was now in despair thinking 'what would he do without his family' , ' what is the meaning of living anyway ' the real reason for living got destroyed in front of his eyes and he couldn't do anything to save them he was cursing himself for being weak and pathetic but after seeing the body of his family members he vowed to himself that he will destroy everything and take revenge for his family. He didn't care whoever it was even if he has to fight against the whole world he will make sure that they pay for doing , what they did to his family.
After some days passed 'levin' buried the bodies of his family and now was thinking back , ' how his sister would tease him on every little thing , how his father used to joke around and how beautiful was his mother's smile and now all of them are gone they left him alone in this cruel world , how will he be able to live when the faces of his family kept appearing in his dreams every night . He remebered how he slaughtered the monsters in rage like he was the strongest after thinking about that for a little while he examined his body and saw three black circle patterns around his biceps he didn't understand why they appeared he thought this was the reason he was feeling stronger as he was thinking about that he suddenly saw a giant creature above in the sky flying as 'levin' was staring him the dragon sensed someone was staring at him and suddenly he shifted his direction at levin, he got paniced and ran for his life he knew that there was no way that he can fight something like that but the dragon caught up with levin and in rage after seeing the dragon he attacked him.
Levin used every method he could think of but that didn't even scratches the dragon, after seeing levin struggling in vain he laughed and said " pitiful creature who so you think you are to attack me " after listening to him levin was suprised that this creature could talk and the one thing that came to his mind was that ' it all happen because of them they were the reason behind his family's death ' and in anger levin started cursing at the dragon " who are you and what do you want because of you my whole family died why did you come to our world what did we do that you destroyed our world " after listening to levin the dragon was grinning and beacuse of that levin totally went berserk he started fighting like a hungry predator while fighting he somehow used fire power which caught the dragon attention but after exhausting himself levin had no energy left and after that did only the dragon spoke " it doesn't matter what you think or say cursing now won't turn back the time and we did all that because our world almost got destroyed so we had no other choice to split open the dimension and cross into this world but we didn't knew it will cause such an affect and also we have no remorse for what we did to survive because only power decides what will happen and you don't have the power to stop me ".
When he said that Levin's mind went blank because of what he said 'they dont regret' and only 'power' decides what will happen. The word 'power' got stuck in his mind and decided that he will become so powerful that one day he will kill the creature who is standing in front of him with pride , while levin was thinking that the dragon said that " i will now trap you in a space time place where you will keep fighting these monsters for over 10,000 years after that it will be upto you if you can break this space time place that i created and free yourself or remain trapped in that hell for the rest of eternity , if you survived " he said that almost grinning and because of that fear ran down the spine of levin muttering "10,000 " years after that 'Levin' said that he will find him and kill him in the most ruthless way , with that 'Levin' got trapped in the place that "Fafnir" created this is the name of the dragon who trapped 'Levin'. When ' levin ' opened his eyes all he saw was a world filled with blood and an army of over 10,000 monsters coming his way at first he got scared bit after remembering what that dragon said to him he forgot what ' fear ' is and charged straight towards the horde of monsters.