The Mental Guidance Technique was actually a cultivation technique for cultivating mental power.
All along, be it for Metamorphic Realm martial artists, Divine Realm martial artists, or even the Nine Sages, there had been almost no cultivation methods regarding mental power.
However, mental power was very important. For example, breaking the genetic lock and achieving life transitions were mainly the effects of mental power. There were also some Astral martial arts that required immense mental power to unleash greater power.
Mental strength was crucial to both martial artists and cultivators of the cosmic cultivation system. To a certain extent, Mental Guidance Technique was far more precious than Combat Body Guidance Technique.
In the vast universe, the Mental Guidance Technique was generally secret and not imparted, whereas the Combat Body Guidance Technique could still be obtained as long as one was willing to pay a price.