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.
On his way to a meeting of Jedi, Yoshi is attacked by an unknown enemy. Stranded without even a lightsaber, he must find out what this new threat wants. Along the way, he meets the beautiful princess Lourdes, and learns a lesson about trusting ancient prophecies.