I Am a Mythical Beast from the Classic of Mountains and Seas, Contracted by the Empress

My name is Bai Yu. I transmigrated to a world where everyone tames beasts and became a contracted beast. Then I awakened the Get Stronger by Lying Flat System. Not only can I gain experience by lying flat, I can also transform into mythical beasts from the *Classic of Mountains and Seas*. My name is Luo Xiaoxiao. I was the supreme empress of the human race, but I fell during a great calamity that befell our people. Now I've been reborn, back when I was still a novice beast tamer. This time, I'm going to become stronger. At the Beast-Taming Tower, I thought I'd struck gold and found a contracted beast with limitless potential. Who knew all it did was lie flat? My life's over! Yet when disaster strikes, this contracted beast that only wants to lie flat can actually...