Peace is a lie. There is only Passion. Through Passion I gain Strength. Through Strength I gain Power. Through Power I gain Victory. Through Victory my chains are Broken. The Force shall free me. - The Code of the Sith.
An evil order of merciless, treacherous, power-hungry murderers and war-mongering warriors, the Sith despise the weaker lifeforms and seek only total control of the galaxy and the Force with the complete destruction of their adversaries, most notably the Jedi.
