Cultivating Presence
One of the hallmarks of the Sith is their ability to manipulate their presence to their advantage.
The Sith is centered; her energy is contained. She gathers within herself the black purity of her heart, all of her predatory hunger, until her spiritual body is grounded with the weight of the concentrated mass.
Like a coiled spring this mass can be unwound slowly or very suddenly, as the situation dictates.
Centered, gathered, she can expand her sense of self beyond herself. It can spread through her entire being and then around her like a cloak.
Experimentation will lead one to find that this cloak, this aura, will change how others react to her. They will move aside; they will not bother her in the street. Experimentation will lead one to find that she can project what she chooses, charisma and intimidation alike. Like any other accessory, the cloak should be chosen with care.
The inverse effect may also be achieved; the Sith may obscure her presence by selecting a shroud, grey and unassuming. In this way she can be easily overlooked and unnoticed.