Mana.
A single word, yet it was infinitely profound. To cultivators who've stepped into the Qi Condensation Realms, their steps on the path of cultivation relied on it heavily. It had many other names, but amongst cultivators, the word 'Mana' had a unique Dao charm of truth.
What did it mean? What was mana?
It starts at the Sixth Stage of Qi Condensation, the False Reality Phase. To ascend to that level, one needed to sense mana, absorb mana, and use it to facilitate the fusion of yin and yang energies. This bestowed cultivators the ability of 'Creation'. The Metaphysical Qi they produce can interact with the world with it, sustain itself for long periods of time, and much more.