After 100 years he look famished because there was no food or water but thanks to his technique he practiced he can make his own food in his body but it has a limit he can only make just to barely survive. He understood that if he don't do something about it he won't be able to take his revenge. He knew if he want escape he have to use space time and dark elements at the extreme level to get out together Necro can use space but at intermediate level so he start training these three element but some time he also train thunder and ice. After 500 years ago he reached extreme at space but he wasn't able to do considerable growth in other two. After another 100 year he made a technique for time which he named eternity which was the best time ability he ever seen if he master this he could stop his aging he already had a space skill which he made in his hometown at age of 15 called Cosmos. After another 300 years he reached extreme in ice and thunder which wont help him to escape but made him extremely strong he reached extreme in space thunder and ice fast because he had affinity with these elements from birth. But after more 100 years he made dark technique called void taking inspiration from place he is in. After another 1900 years he reached extreme in time element. After another 2000 years he reached extreme in dark element after this sudden breakthrough he cried tear of joy after the countless years he trained without eating sleeping he just trained for revenge but its not over he now have to combine cosmos eternity and void in one technique which is really hard he tried every day to combine them. After another 1000 something happened it worked he combined his 3 technique he landed to a forest from very above he was bleeding badly and don't have any energy left because he used all three technique together he get up and start walking slowly to east finally he saw a town but in boards there were an unknown language written on board he could understand people though he saw nearly every race but high humans so he concluded that every other high human died. He then starts crying because after 6000 years he is back for revenge but now he have to focus on recovering because even after he became really strong at this 6000 years but after combining his three skills together and using it made him 90 percent weaker it would take quite time to recover. Now he decided to go to the city to recover while he was going there he understood something at a certain board it was written "year 16000" he thought in my so really 6000 years have passed now i don't fave time to think i have to eat something.