My Swallowing Upgrade Has No Upper Limit

One day, Chen Rong was delivering food when suddenly, a huge hole appeared in the sky. When he opened his eyes again, he appeared in Canglan Continent. 130 Years ago, the disaster broke out, and most of Canglan was occupied by disaster beasts. Ordinary humans became the blood prey of disaster beasts. Humanity established a federation and retreated to seven major city-states, relying on high walls and energy barriers to resist the invasion of disaster beasts. The disaster beast's flesh and blood are mottled with energy and cannot be used for cultivation. Only a small part can be used for pharmaceutical research, and most of them are disposed of as waste. One day, Chen Rong discovered that he could devour them.