Ki

Ki (氣) is the flow of life energy in people. Although it exists separate from mana, they can influence each other.

Overview
Ki is the flow of life energy within people's bodies, including humans, elves, and devils, and is affected by their thoughts and actions. The quality of a person's ki is influenced by their emotions and intents, such as people with tumultuous emotions have equally chaotic ki and those filled with malice have unsettling ki.

Each individual's ki is unique, and it is rare for different individuals' ki to be the same.

Sensing
With proper training, ki-sensing can be used to predict attacks and others' movements, including natural objects and events found in nature. It can even locate invisible people.

By tracking another person's ki, a sensor can detect whether or not that person is lying.

Manipulation
Mages unconsciously manipulate their ki when generating their magic power. By deliberately manipulating their ki, some mages can temporarily boost their magic power and physical strength.

Trivia

 * Ki, or qi, is a life energy in Chinese and Japanese culture.

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Ki