The New Eastern Champion (book 3)

With the Shane gang and Junjie lost in the deep caverns and the Emperor, Blakk, Goon Doc, and Tad on the lose in both the 99 Caverns and the Eastern Caverns, Kerien has had to step up as the Eastern Champion in her best friend's place. With growing powers and a ghost from her life on the surface showing up, she needs her friends more than ever. While she protects their homes with her resistance, aided by Will Shane, Lian, and Drew, the Shane Gang is trying to figure out a way to return home when they come across a figure from Slugterra's ancient past, who reveals the secrets of their home...

Past and present collide as old enemies and lost worlds go head to head in the war for Slugterra.