So maybe some spoilers here from the Sky Pirate raids etc, but not anything from any recent content so I think we're good.

So there are some voidsent like Diabolos, and Ferdiad that we've fought more than once. So my question more or less is...what happens when a Voidsent is slain in Eorzea/Hydalyn? With the exception of some Voidsent like Diabolos being perma killed with the Nullstone, do most of the voidsent we slay just go right back to the Void, similar to how WoW demons would be sent back to the Twisting Nether to regenerate their bodies when killed under normal circumstances? Or is it just more powerful voidsent like Diabolos that would require special means to kill?