Invincible Sword Dao: Starting with My Sister-in-law's Request

Ten thousand years ago, I suppressed a hundred races with a single sword. Ten thousand years later, how dare you draw your sword against me? ... Sword Dao powerhouse Ye Chong is reborn ten thousand years later, only to find ancient history erased, time lost, and humanity in decline. His beautiful master, lovers, and friends from the past are nowhere to be found... His widowed sister-in-law, plagued by inner demons, asks him to help her conceive a child... Ye Chong grips his sword tightly and charges forward without hesitation! One sword to slay gods and demons, one sword to cut through the heavens, one sword to sever a million years of time! I am a sword cultivator, and I am invincible at the same realm! One sword out, and the world is undefeated! — Description from novelcodex.org