So, I was looking at my guide book today, and I saw that when the Necromancer hits 300 ABP, he learns Zombify, so any job class can use it.
But tell me this, who would want that?
By giving someone that ability, they cant be healed, they take damage!
Can anyone explain?

In many FF games, there are certain special properties that being undead grants a character. I can't recall what those are though in this game.

The only one I know is that if you drain an undead, the effect is reversed.

But they can't die can they? if they are zombified?

Yeah, that's true. However, if your other two characters end up being KOed, then the effect is the same --- Game Over. Otherwise, that is a potentially useful attribute.

Ah ha, thank you.
I can see where that is helpfull. :)