Ki was a form of inner energy used by certain creatures to perform special techniques beyond normal physical ability. Typically employed by Monks, the energy was inherently magical, but differed from traditional Spellcraft. It was attained and channeled through focus, discipline, and control over the body and mind. Monks could use ki to move faster, strike with greater precision, or defend themselves against harm.
In practice, ki allowed monks to act with speed, power, or calm in situations where others might fail, and had a unique but mysterious connection to the Astral Border. They could use it to make faster attacks, dodge incoming blows, or perform short bursts of movement. Ki was limited in amount, but could be naturally restored to the body through rest.