Hell king (The path from a weakling to a king)

It all began 20 years ago when the world changed drastically . A terrorist organisation called the armour head started the nuclear war as a result 85% of the world population was wiped out the climate of the world became harsher than ever those who died were remembered by no one and those who lived were the survivors of hell . The change in the climate caused due to the nuclear war was hell for humans but it attracted the attention of some unwanted guests and for them this climate of the world was like an oasis in the desert these creatures were named X-nemesis they were far more intelligent than humans and they wanted to wipe out the last of humanity who were surviving in this hell .