FAIRY TAIL Vol 50

From the Kodansha edition

Natsu, Lucy, and Happy are on a journey to find their former comrades and revive Fairy Tail! They've managed to meet up with Wendy and Carla, who have joined Lamia Scale. But before they can start celebrating, there's trouble! Then it's on to the Village of the Rainmaker, where they discover Juvia has gone back to her old ways, for a terrible reason: Gray's gone missing! Could it have something to do with the black magic cult Avatar?! With so many obstacles in the way, will Fairy Tail ever be reformed?

Source: Anime News Network Encyclopedia