We've seen that dying in the Void isn't as permanent as it is otherwise, as the Guardian Tree manages to bring back party members who die in the battle with Neo Exdeath. Now, when Gilgamesh used Self-Destruct to kill Necrophobe, what it did was rip open a localized hole in the Void, throwing him into another FF world. * Considering all the implications that Square's made that all the Gilgameshes we see are the same guy, this is probably canon. * But he still can't tell the difference between Excalibur and Excalipoor.