The aura is a byproduct of the body. Change the body, change the soul. The body's experiences can be summed up in the aura, but this phenomenon is the product of physical forces. By fleshcrafting certain locations on the body - chakras, joints, erogenous zones - a Tzimisce with this power can paint whatever aura he chooses. Auras summarize the individual, revealing mood, the stain of diablerie and the Curse of Caine. When under the gaze of perceptive eyes, sometimes its better to conceal such things.