In the Cang Mang Domain, Cultivators who reached Jiang Shu's level of Realm long stopped consuming ordinary grain.
The essence rice at the Spirit Rank and Earth Rank is certainly decent, but even the annual harvest grown by the Sects is extremely limited, so it's impossible to truly enjoy it to the fullest.
As for the meat of Demon Beasts, it's feasible to rear and slaughter those in the Condensing Seed Realm, but Inner Core Realm Demon Beasts have all awakened their Spiritual Wisdom. Some can even trace their bloodline's source and join the Demon Race directly.
How could they possibly be slaughtered in large numbers?
Therefore, even True Disciples and elders of a Sect in the Cang Mang Domain do not lack Crystal Stone Vein resources. However, they rarely come by or even see flesh of the same equivalent level and Realm for consumption.
