An Empire from the Start, and the Emperor Sends Me a Princess

[6 Systems, 4+6 single heroines or no heroine, 7+0 fantasy, 6+7 imperial dynasty, 6+2 invincible with a System] [Plot-driven, with a well-grounded story] [Completely different from anything in the same genre! 99% original, 1% pure coincidence] The protagonist, Xue Yang, transmigrates to the Tianzui Continent and becomes the young master of the Great Xia Dynasty's Defender General's household. After transmigrating for eighteen years, he has no interest in cultivation, but is an expert at eating, drinking, and having fun. He even brings all kinds of pastimes from his previous life into this world, and eventually obtains the Ultimate Life System. The motto guiding the protagonist's life is: Enjoy life, never give up, experience the world, and refuse to lie flat. The Ultimate Life System will stop at nothing to help its Host enjoy life to the fullest and experience the world better. Whenever he accomplishes something influential, the System will grant him a random reward. Shadow Guards: Their members are spread throughout the world. Hailed as the world's strongest intelligence organization, there's nothing they can't uncover. Black-Armored Dragon Cavalry: Wherever their black armor appears, not a blade of grass survives, and corpses litter the land. Innate Dao Body: The strongest constitution, it cultivates automatically, allowing its owner to advance even while lying flat. Indestructible Vajra: Once mastered, it is impervious to all techniques, with skin like bronze and bones of iron. At its peak, it can sweep across the ages.