Qi Barrier

Any Xiandao or Shendao Cultivator has an invisible Barrier that they are constantly manifesting, to protect themselves from attacks. This barrier is powered by their Qi, and its strength can be seen in the Cultivation Screen -> Battle -> Scroll to the bottom = Barrier Power
The effectiveness of the Qi Barrier is known as Barrier Power. The higher the Barrier Power, the less Qi damage the Cultivator takes. For example, a Cultivator with a Barrier Power of 2 takes 0.5 Qi damage every 1 point of damage received, and a Cultivator with a Barrier Power of 100 takes 0.01 Qi damage every 1 point of damage received. 
It is determined by the following Properties:
* Barrier Power Bonus (damage/Qi), (NpcFight_ShieldConversionRate), found in Items&Equipment (the Sword icon, default hotkey Z) -> Stats -> Battle Stats
* Barrier Power Bonus (Percent), (NpcFight_ShieldConversionRateAddP), found together with the above
* Barrier Conversion Bonus (in /point), found written on clothing
Raising a cultivator's Protect skill will improve one's Qi Barrier.