Therefore, Ru Beasts can survive and cultivate in the "Domain" of the grotto-heaven without being affected.
Since the essence of a Ru Beast is the Time Shuttle Stone, its corpse will turn into nothingness when taken outside, though its Beast Core will remain.
The existence of Ru Beasts not only consumes the power of spacetime, but the Beast Cores formed through their cultivation can also be used for one's own cultivation—it is a brilliant, two-birds-with-one-stone solution!
Chapter 243