User blog comment:Miskos3/Fairy Tail 525: Why Did the Emperor Never Love His Child?, Review/@comment-28408126-20170304183714

Totally unrelated from the chapter, but watch Irene enchant herself or her magic, at the last minute before she died, into Erza so that Erza can defeat Acnologia #pleasenot. Or probably, Irene did the Itachi move where she left an enchantment to Erza that would protect her from danger. Sort of like when Itachi implanted the Amaterasu in response to Madara's face.