Legend of the Ten-Tailed Dragon
(Note: nobody use this except me)
Legend tells of a monster dragon, the last of its kind, the eldest offspring of the no-tailed spirit, and the most powerful tailed beast in existence. It had the power to create a storm of fire, an enormous tornado, or a massive earthquake with a flick of one of its ten tails. Not a single Shinobi could defeat it, not even the First Hokage. It wreaked havoc, trying to rule the world, destroying everything in its path, searching for power. It drained ninja of their energy, till there was nothing left except a body. Everyone died who met the dragon. It drained the power of all the other tailed-demons till only orochi, the shukaku, and the kuybi were left. But they united to defeat the monster, forming the hundred tailed behemoth. They crushed the dragon with they're combined powers. But they were unable to kill it, so they sealed it inside a cave. But a prophecy says that one day the demon would rise again.