Incarnum

 It is a kind of energy based on the soul. By drawing upon the spirits of past, present and future the shaper (usually a Meldshaper) can become better at fighting, more skilled, or gain special abilities. To draw upon soul energy, the meldshaper first shapes an item called a "soulmeld" out of soul energies which occupies a chakra on the body. In this system, there are ten chakras: crown, brow, throat, shoulder, arms, hands, hearth, soul, waist and feet.

After shaping a soulmeld, the meldshaper can invest his own soul energy, called essentia, into it to make it stronger. A meldshaper can also bind a soulmeld to a chakra to enhance it's power and get even greater benefits from it.

Integration of Incarnum use into a battle or role-play with traditional magic is similar to the way psionics are incorporated. The standard rule is Incarnum–magic transparency, which is essentially the same as Psionic-magic transparency... though there are ways around both.