FAIRY TAIL Vol 47

From the Kodansha edition

Desperate to stop the Face bombs from going off, Natsu and Gajeel face off against Tempester and Torafuzar from Tartaros! Meanwhile, Gray emerges from his dramatic encounter with Silver with a new power: demon slayer magic, and Erza finally reaches the control room only to find it infested by demons! The Book of Zeref’s worst denizens stand arrayed before Fairy Tail’s wizards… Can they defeat them and preserve the magic of the entire continent?

Source: Anime News Network Encyclopedia