BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
The Youtini Expanded Universe Ranking system is a 1-5 scale that ranks EU book quality, difficulty, and importance. Books closer to Level 1 are easier to read and understand, more important, and of higher quality.
Years ago, when they were both Jedi apprentices, Ferus Olin and Anakin Skywalker were rivals. Now, their paths are about to cross again… Abandoning the Jedi Order saved Ferus's life. As a result, he is the only one who can track down and save Jedi who have survived the rise of the Empire. He has rebellion on his mind, and hopes to bring about the fall of the Emperor. Only Darth Vader stands in his way. Ferus may not realize it, but his old rival is now his new deadly enemy.