User blog comment:Mangetsu20/Magic Science! (FTC - 451)/@comment-26689944-20150913051459

Well Actually i have a theory on how Fairy heart works and now don't call me crazy but Zeref's Ark- whatever the fuck its called stupid Hiro- 'Killed' Mavis but mabis was immortal so the Curse is still there which is what is generating the eterano but since mavis is technically dead the magic keeps spreading and growing and shit. And the magic is being gathered in the Lacrima around her.

Although my theory may be hog wash and Hiro is gonna say its the power of LOVE!!! >-> Fuck you Hiro