Seeking X-Zone information

X-Zone is just a normal multitarget spell that sets Death and has the "delay counterattacks" special property, with a funky animation that removes enemy sprites.

You can easily change any spell to be identical to X-Zone with FF3usME's spell and animation editor. I'm not sure what the code in the menu bank (C3) does, because I don't think X-Zone is usable out of battle. In past FF games, X-Zone and Warp were similar spells that would warp you out of battle if used on your team, and kill all enemies ("teleport them into the void") if used on the opposing team. Perhaps that code is leftovers from earlier designs.