Rise of the Dragon King: Rebuilding the Last Empire

Having a hard life everyday being poor and bullied at school,the young genius orphan Luke Samuel died, he was push from the rooftop of his school while dying all of his regrets was he didn't fight back and work hard for his life, with the last tears and sadness in his buying eyes. he wish he would be reborn and start all over again.. he was reborn as Luke Von de Dracon until his late 20's live his life as a prodigy of the Draconian Clan descendants of the Dragon king. but then the tradegy came a unknown creatures appearead out of nowhere in a portals in the sky, raised havoc all over the whole continent and destroyed all the cities and kingdoms with the last stand in the castle of the Dragon Luke led his clans men and soldiers to fight and defend the castle facing the thousands or even a millions alien creatures. But they didn't stand a chance, watching his clans men and trusted aids dying before his eyes he charge into the enemies and wish again to be reborn and start again. Fate didn't abandoned him and he was reincarnated but 10 years later? with all his knowledge in his past life will he achieve his goals and dreams? he woke up as a child in an entrance of a small cave facing the unending wasteland left by the alien creatures.