Meng Chuan sought out Meng Tianzheng and told him about the Immortal Ancient Era realm in the Three Thousand Dao Provinces.
Then Meng Chuan asked Meng Tianzheng to make a trip to the Three Thousand Dao Provinces and bring that realm back.
As for the immortal scriptures and other resources inside, Meng Tianzheng could handle them as he saw fit.
If Meng Chuan collected them and they ended up in his pocket, they would have to be exchanged for military merit.
Meng Chuan did not care about those things. Letting Meng Tianzheng have them was fine too.
Meng Tianzheng had only recently become a True Immortal. Though his cultivation was already profound, he still needed to build up his foundations in the Immortal Dao.
Most importantly...
If someone else could do the errand, Meng Chuan could not be bothered to go. Running all the way to the Three Thousand Dao Provinces and back sounded exhausting.
A True Immortal would have no trouble packing up the entire Immortal Ancient Era realm and taking it away.
"Heavenly God Tree, the Longevity Immortal Medicine White Tortoise Carrying an Immortal, immortal scriptures..." Meng Tianzheng recited the list.
"In the Immortal Ancient Era, any of these could have helped produce a True Immortal."
"A pity we don't know whether the Heavenly God Tree can ever return to its original form."
Each Longevity Immortal Medicine might have its own specialty: spirit, magical power, flesh, comprehension of the Dao, and more.
But they all shared one effect.
They could help someone become an immortal.
Why else would they be called immortal medicine?
Every Longevity Immortal Medicine contained complete Immortal Dao Laws. If a living being swallowed an entire plant, they would undoubtedly become an immortal.
Swallowing a whole Longevity Immortal Medicine meant accepting all the Immortal Dao