Fairy Tail Volume 19 by Hiro Mashima
Erza finishes off the last of the Oracion Seis, only for the master of the evil guild, a wizard named Zero, to appear and keep up both the fight against the good wizards and the attempt to destroy the Cait Shelter. Zero is obsessed with only one thing--destruction! So he makes a pretty good villain for just about anybody. The story gets awfully close to wrapping up in this issue, but I guess I need to go one more to see the finale.
The volume also includes a little side story about Lucy's most fateful day. The story is cute but reads like filler.