User blog comment:Ncduru/War Is Finally Here! Predictions, Theories, Rants & Raves/@comment-24403746-20151008185449

... Your theory about why Zeref want's LH is just... I can't even ._.

Why would Zeref even want to defend against Acnologia I mean the brute is a fearsome foe but isn't Zeref's intention to just you know... Die .-. if he needs to defend against Acno means he's able to kill Zeref meaning our black wizard could easily go: 'My body is ready/Come at me bro!' on Acno to commit suicide and finally enjoy the silencing embrace of death.

- An even more logical explanation from how we heard how LH could be used spamming OP shizzle like Etherion is that Zeref want's keeping firing it at himself hoping he can commit honerable sudoku (seppukku).

- Another reason for his whole war against humanity and getting LH is so he can use it for a slightly derived reason from mentioned above and to just combine LH's 'infinite source' with something powerfull like Etherion so he can use it to mass murder more people to prevent others close to him from dying to his curse or something along those lines. :s I dunno the whole curse thingy is still a bit vague to me how it affects everything + himself.

- Only other random option I can think of he just wants Mavis' body because... eternally pedophile I guess so why tha hell not have an eternal child as yer partner. ¯\_◉‿◉_/¯

Comming back to the rest: plz no Ice dragon slayer T^T we have enough slayers already and not enough real slaying of their respective targets... :/ (altho I gotta agree Ice Dragon Slayer sounds soooooooo epic) Obviously Natsu's technique will have a serious downside otherwise he could spam it from the start on anything we've seen since the 1 year time skip.