User blog comment:Wrath022/Chapter 516: The Truth About Enchantment, Review/@comment-29963364-20161228051353

1.) Erza's Bunny Armor
 * Erza has a "wierd" fashion sense. She loves to wear what she considers "cute."


 * It has even been stated (in the earliest chapters of the story) that her favorite outfit is her Bunny Suit. So it actually makes sense that one of Erza's strongest Armors (assuming since she used it to fight a strong enemy like Irene) would have bunny-like features.

2.) Irene-Wendy Compatibility


 * I admit... That seemed kinda forced. Hiro kinda wrote himself into a corner when he made Irene a character that was on-par with Acnologia (since she, too, is a Dragon), and pit only Erza and Wendy against her. He couldn't just make Erza pull another "bull-shit come-back" like he has so many times already. And even if Wendy is a Dragon-Slayer (the only mages capable of even scratching Dragons), she can't "suddenly" be powerful enough to make a signifucant difference against Irene. So this is Hiro's attempt at giving Erza & Wendy a way to defeat Irene, while still making it extremely emotional and difficult (since Erza probably can't bring herself to hurt Wendy after Irene "possessed" her).

3.) Demon Seed, Dragon Seed, and E.N.D.


 * Unlike all the other Etherious Demons that Zeref created, Natsu wasn't created purely out of Ethernano, but was originally Human. So it's likely that the Demon Seed was created out of Ethernano (just like the other Demons), and Zeref inplanted it inside Natsu to act as a "Life-Force Sustaining Device" to bring Natsu back to life. And just like how the other Etherious Demons are bound/connected to their books, maybe it's the Demon Seed inside Natsu that's connected to the E.N.D Book, and Zeref damaging the Book stimulated the Demon Seed to start growing inside Natsu.