Rexicus is the brother of Jedi Master Arden Brandwyn. He was raised with Arden, not knowing they were brothers they simply became friends, and was the first Padawan of Jedi Master Warek Mychi. During the raid on the Jedi Temple after the issue of Order 66, Rex and Warek were separated. Warek and Arden believed Rex to be dead and fled the planet (full story found in Star Wars: Hidden Jedi -The story of Arden Brandwyn, book one).