The reason Lin Chen didn't inject spiritual power to activate the defensive power of the defensive robes was that he hadn't refined these two robes at all, which was also why Lin Chen was able to wear two robes.
Typically, after a martial artist refines a robe, they can only wear one robe and inject spiritual power to activate the robe's defensive effects.
However, Lin Chen's current cultivation was not sufficient to refine these two robes, so he could only wear them to utilize their inherent defensive capabilities. It must be said that Lin Chen's approach, though unconventional, was quite extravagant.
Such wanton use of robes was probably unique to Lin Chen.
As weakened power of thunder and lightning continued to strike Lin Chen's body, the Heavenly Thunder Pearl inside him immediately began to crazily absorb that power of thunder and lightning.
