But, as there was still the risk of the Mandate and Mu Di Bai's opponents, it wasn't very likely that he would be allowed to appear as himself. The other concern Di Tou had was that with his greater knowledge of cultivation, he understood that there wasn't such a thing as 'adding lifespan' in this world. It wasn't like once magically gained life force, but rather, it was a matter of slowing down one's aging process and the natural energy of the world serving as a tonic of sorts.