Cao Zhen felt that since he had encountered Linghu Gudu, Immortal Lord Yun Huo, and others once again, he might as well continue along with them.
Besides, the location here was already quite deep, and the dangers had increased.
With so many humans here, including his disciple, he couldn't just ignore it.
So he chose to continue hiding his identity.
As for the color of Samadhi True Fire, it didn't seem to have any special characteristics.
If everyone here could use immortal energy, the release of his Samadhi True Fire would naturally be sensed by others as something different.
Linghu Gudu had seen Samadhi True Fire before and could naturally determine that he was using it, thus guessing his identity.
But now, when everyone couldn't use immortal energy, Linghu Gudu couldn't determine that he was using Samadhi True Fire!
He wanted to keep a low profile, but unexpectedly, he still stood out; the issue wasn't his speed being too fast, but these people's speed being too slow.
