Revenge of A thousand Years

In the cultivation world a long time ago there was a clan with great power and comprehension of martial skills and techniques. But the surrounding clans felt threatened by their power and decided to plot against them. Forming an alliance they decided to destroy the clan and all of its members but the patriarch of the clan did not go without a fight, in fact he was the sole survivor of the clan. Thousand of years further and he's decided to find out the truth and take his revenge.