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.
Following the death of Imperial Guard turncoat Carnor Jax at the hand of the last Guard, Kir Kanos, the Galactic Empire suddenly finds itself devoid of a leader, and an Interim Council is assembled to rule the Empire until a new Emperor can be selected. But when Council members become targets for assassination, Kanos becomes the prime suspect and again stands at the center of a storm!