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 planet of Ryloth has fallen under siege by Separatist forces. Now Mace Windu must lead the clone army against the evil Separatist Alliance. Only the power of the Force can liberate the people of Ryloth from the brutal droid occupation.