Sith Knight

A Sith Knight referred to a member of the Sith Order, who had completed their Sith Training as a student in the Sith Academy, in addition to one-on-one training as a Sith Padawan and the completion of the Sith Trials.

 Sith Knights In The Shadow Empire 

After their decade long training as a Sith Acolyte, the students will go through the Sith Trials. Only the Dark Council will be able to rank a Sith Padawan into a Sith Knight unless their Sith Master sees fit. In the order of the Dark Lord of the Sith Onepath Rainwar, a Sith Knight would have to train another decade to be the rank of Sith Master. However, if a Sith Knight still has their Sith Master with them, they can promote them to Sith Master if they see fit.