Dragon Blood Warrior

What exactly is this continent like? What happened in ancient times? Why did all four heavenly beasts and four dragon-blooded tribes disappear into the dust of history? This continent is called the Warrior Continent, and all warriors practice a special energy called "War Air," a soul from the 21st century, coincidentally reborn into a warrior of Huailong blood, so how does this teenager, who is destined to carry many mysteries, get out of his path?