Old Man Lao could see several bits of information in the documents that seemed unusual to him.
'Emperor Feng said that the Grand Tempest Transcendent Immortal Tribulation is the most dangerous one out of them all. Thus if the Demon were to know that he was about to go through one, he was probably preparing.
And considering the properties of the Violet Mystic Life tree, perhaps the demon relied on the tree's vitality to endure this. After all the Tree was already comparable to a Peak Immortal existence.' Old Man Lao thought after reading it all.
This seemed to be the only possible explanation to him all.
He did think that it might be someone else that might have undergone the Transcendent Immortal Tribulation. But it would be far too much of a coincidence for there to be multiple peak grade immortals in the Desolate Blood Battlefield.