It's not that Lin Qianxuan was playing around with Guan Hao for fun.
He wanted to see the effect of planting with "Divine Wood Skill."
Lin Qianxuan himself hadn't practiced this divine martial art.
The reason remained the same; this martial art requires simultaneous cultivation with the visualization method to be effective.
The visualization method is critical to one's core martial arts.
It influences the attributes of Divine Energy.
Generally, there is no martial artist who can cultivate two or more visualization methods at the same time.
Multiple visualizations might cause issues with the Primordial Spirit, conflicts with Divine Energy attributes, and directly lead to becoming a lunatic.
Of course, there are exceptional circumstances.
Emperor Shenwu is one of them.
According to records, he cultivated more than a dozen visualization methods.
A remarkable life needs no explanation.