Gray decides to fight alongside his comrades, but also realizes that a battle against Zeref would mean a chance to get at E
While being served drinks by Fried, Gray asks the male Thunder God Tribe members about their experiences in Blue Pegasus.  A brawl soon breaks out and Gray immediately gets involved. The fight is halted by Makarov, who expounds on the threat posed by the Alvarez Empire. But Natsu succeeds in delivering a speech that encourages his guildmates to face this adversity. N.D. Suddenly, Mavis appears in front of them, stating that they will need to know about her involvement with Zeref if they want to know why Zeref is after Lumen Histoire, whose true name is Fairy Heart. 
Gray is left in utter shock when Mavis reveals that Fairy Heart is in fact an infinite source of Magic Power, capable of feats such as firing the Etherion nonstop. When Mavis is upset about causing all this strife, Gray expresses his gratitude for the creation of the guild, lifting her spirits. Obviously confused when Juvia starts crying out of nowhere, Gray asks her what’s wrong and she explains that she feels for Mavis, since she now has to fight the one she loves. Afterwards, the topic of Zeref’s immortality is brought up,  and Natsu mentions that his right arm is something that can do the job, but he refuses to tell what it is, causing Gray to attack him. Shortly after, Gray listens as Makarov goes over all the information he gathered about the Alvarez Empire. 
As Gray and the group struggle with their respective robot opponents, Wall leaves to assassinate Fried
Sometime later, Gray stands alone on a balcony, where he is approached by Juvia; he tells her that https://loansolution.com/payday-loans-mi/ he is grateful for her always being beside him, and tells her that when the battle with Alvarez is over, he’ll give her an answer about how he feels towards her. He finishes by saying that for now he wishes to focus, and that like Natsu, he too has an ace in the hole for fighting Zeref and E.N.D.  Not long after, Gray and Juvia witness a fleet of fifty Alvarez airships led by Ajeel Raml descend upon Magnolia.  As the fighting begins, Gray notices Bisca firing Jupiter towards the attacking ships and comments on Mavis’ strategy being scary.  Soon afterwards, Gray senses that the barrier Fried has erected to protect Magnolia has been breached and immediately heads off to face the invaders,  encountering Wall’s squad. Reinforcements soon arrive in the form of the Strauss siblings, with Mirajane revealing that she saved Seilah by taking her over. While her siblings praise her kindness, Gray deadpans that the result is just the theft of the Demon’s body and powers, but is amazed when Mirajane uses her Macro to send most of their opponents to sleep, leaving only their leader and a few soldiers.  A bit later, Gray is caught in Ajeel’s Sand World and his visibility in his fight is greatly hindered. 
Eventually, due to Ajeel’s defeat at Erza’s hand, Sand World dissipates and the group faces the robotic creations of Wall Eehto, each designed specifically to counter one of the five Mages present.  However, by swapping robot opponents, Gray and the others are ultimately able to overcome the weakness-targeting abilities of the robots,  and ultimately stand victorious.  At that moment, an explosion takes place at the Kardia Cathedral, surprising the group and making them worry about the Thunder God Tribe’s safety.