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.
The ruthless bounty hunter Cad Bane infiltrates the Jedi Temple and attempts to steal the Order's most guarded secret. It's up to Anakin and Ahsoka to stop Bane before he can use the secret to bring an end to the Jedi forever.