Oww,, Mavis won't die. At least that is what i expect. ╮(￣▽￣)╭

she's not dead she was cristalized and propably in a future she's going to awake with her real body

So is that's what is in the basement of the of the Fairy tail guild?, her body?

yes thats lume histoire

Yeah,but zeref said that the spell's real name is Fairy Heart. It's powerful than the 3 Grand Fairy Magic (=・ω・=)