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 sith code, guiding our mighty orders existence and how we live.

Sith acolyte is the first step towards becoming sith, it's the rank you get when "adopted" by a sith master, who guides your training until you become a fulworthy sith. This armor is called "Eradicators Warsuit" in the game and is bought from the Cartel market, with the mask and lightsaber sold separately.

Acolytes and sith warriors wearing this armor are seen in the cinematic trailers "Hope" and "Decieved"