I Have a Devouring System, Sweeping Across the Heavens

After Lu Fan dies suddenly, he is transported by a system to the world of cultivation, where he is one of a thousand people who each possess a system. They can devour each other to grow stronger, a 'culling' orchestrated by those above. Unable to resist the higher powers, Lu Fan only wishes to survive. Thus, with different goals in mind, they all employ every means at their disposal, where the victor reigns and the vanquished perish. — Description from novelcodex.org