Doral Mension AKA Darth Vasion, is Dela-Gre's sith master. When he was younger his master was extremely cruel. He even cut off Doral's arms during training to teach him pain and anger.

After awhile Doral couldn't use the force due to his artificial arms, but when his master sent him on a mission to assassinate a rogue of the sith, his face was damaged in the fight. He managed to regain his ability to use the force and killed the rogue. He took the three lightsabers the rogue used and sought out the doctor that gave him the artificial arms, ordering him to make a modification to it and to patch up his face. The modification allows him to split the mechanical arms into two, so he could have four arms to use, just like General Grievous. He modified the three lightsabers he had gotten from the rogue to interlock with his own, making a quad-lightsaber, however it could split apart to make four single lightsabers.

With that he returned to report his master and when his guard was lowered, Doral killed him.

It's a little hard on Dela-Gre, but not cruel like his master was to him. He guides her and gives her difficult missions at times to see how well she can do.