The Suppressing Dragon Elephant technique was inscribed on a piece of beast skin.
That piece of beast skin, originally, Chen Fei felt extremely miraculous about it, impervious to water and fire, and swords couldn't harm it.
However, as Chen Fei's current realm has improved, he has found that the piece of beast skin actually comes from a Third-Tier monster.
For Chen Fei, who was only in the Body Tempering realm at the time, a Third-Tier monster was naturally extremely mysterious, possessing various incredible qualities.
There was also the Suppressing Dragon Elephant Spirit Tempering that Chen Fei later obtained from the Dragon-Elephant True Immortal. That beast skin was also a Third-Tier monster, but it was a peak Third-Tier monster.
As for some parts of the Suppressing Dragon Elephant Soul Tempering, they were obtained from the master of the broken ruler.