Martial Arts Ancestor and the Cultivation Clan in a Box

Fang Lin transmigrates to a world of martial arts and, from the start, becomes a human medicine source whose blood and energy are drained by others for cultivation. Luckily, he has a little box connected to a world of immortals. With one slap, Fang Lin can flatten a mountain inside it. The little box also contains a cultivation clan that serves Fang Lin as its founding patriarch. He helps the clan grow, and in return they offer him cultivation techniques, magical treasures, and spiritual medicines from the immortal world. In the martial arts world, cultivation lets him shatter the void. In the immortal world, resources multiplied a millionfold build him a celestial court in the mortal realm.