FAIRY TAIL Vol 19

From the Kodansha edition

With Erza facing off against Midnight of the Oración Seis, it seems that the allied guilds will finally be able to defeat the final Oración Seis member and stop Nirvana! But the defeat of the sixth villain only means the coming of the ultra powerful master of the Oración Seis Guild, Zero, who desires only destruction!

Source: OpenLibrary