If it was pre-Flashpoint; the answer might just be ‘zombie’. If someone was dead too long, they would come back wrong. Ra’s threatened this with the bodies of the Waynes.

Post-Flashpoint; hey, Tupka called it. What’s a lazarus pit now? Dionysium? And now that it’s a divine metal (it was a chemical compound in NE) I second the call that Snyder would make it do whatever he wants. Even Tom King was going to bring back Martha Wayne’s long dead corpse in Batman #74.

Tom Taylor seems pretty good about deaths in his stuff being pretty permanent. After issue 4, I don’t see him using anything like that. Taylor likes to just kill as many heroes as possible lol