407:
Good thing Juvia isn't there to see Gray now. She wouldn't be able to keep her panties on. In any case this is undoubtly Gray's moment of glory. He just arrived and seemingly already hit Mard Geer harder than the three dragon slayers combined, assuming the demon king dude doesn't just shake the absolute zero ice off his arm.
I wonder what Mavis's deal is. Why must nobody know of it? Zeref is hanging around all the time (literally), which means he ought to know what lumen histoire is all about as well. The spin-off series revealed Mavis is an illusion mage. That alone could suggest some bullshit like a part of the world of magic is just a grand illusion, but that theory wouldn't hold with Zeref. It's just pretty hard to imagine great many truths about the world that absolutely need to be kept secret.