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.
Ferus Olin's allegiance is to the Jedi. But when he's summoned to see the Emperor, the Sith Lord makes him an offer he can't refuse. If he can manage to prevent a planet from plunging into chaos, the Empire will spare Ferus's captured friends. And if he doesn't . . . they'll die.