Asura (manhwa) is a Manga/Manhwa/Manhua in english language, Adventure series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The commander who was sent to discover the secret of immortality by the absolute ruler who first unified the continent never returned. The ruler believed he would find the secret no matter what corner of the world he had to search. But by the time the ruler died and the empire fell, he never came back, leaving only countless speculations. Eventually, he was gradually forgotten in the memories of people. And after a long time passed…