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.
In a galaxy suddenly hunting Jedi, Master K'Kruhk is on the run with a group of young Padawans. Crash-landing on an Imperial-run planet, they hide in a refugee camp filled with thousands of others displaced by the end of the Clone Wars. But the camp isn't safe, so K'Kruhk and the younglings escape into the wilderness - only to stumble upon an evil greater than they could have imagined! Meanwhile in the Imperial capital, Darth Vader grooms a deadly new tool for the Empire!