I guess that would depend on who writes it. If it's just an undertaker or something similar, what's on the marker would be pretty cut and dry. Born x, died y, RIP. But if it was a friend or even an enemy, that person should have something to say that would connect 'em to the living impaired. ^^

It's writen by the person that basicly kills him, so I suppose it is his murderer, but no on else knows that she killed him.

Well, then it would depend on why she killed him. Would she write something to honour her great opponent, or something offensive to the friends of her enemy? Or maybe she killed him for a reason that has nothing to do with those kinds of epitaphs...

It also kinda depends on the method. If it was an assassination, then she probably wouldn't want to be anywhere near the tombstone, to keep from being discovered. Honorable combat settings tend to fit nicely with some word of praise or something, and a straight up slaying would probably demand something prickish. *nods*

She kills him because she's found someone else to fill his place. They whole sort of 'moral of the story' I suppose is the fact that his parents were right about this woman and he dies knowing that she was exactly who his parents had said she was.

The thing is though, is that she is the creator of everythig in this world. She put a curse on Toen so that if he tries to say anything, his death moves closer towards him.

So she smote him? It's hard to understand the whole situation, but it sounds to me like she was the bad person in the situation... so probably something lording and jerkly (my word!).

That's sort of what I was looking for.
Well, he's a short summary I suppose.
Toen's parents were killed because they created Toen, a mix of god and demon. He strives his whole life to kill the woman that killed his parents, but in the end, he changes and finds that it is best to grow up and except the deaths of his parents. From there, he becomes the muderers right hand man. He gets married, has a kid and everything's going great... until Sozosha, the muderer basicly tells him that he has to die to make room for a new god.
She puts a curse on him that will basicaly eat his internal organs so that there is no real way to tell outwardly that he's dying.

You'll have to do a lot of plot loophole sealing to cover the 'room for a new god' aspect, what with the basic definition of a god suggesting omnipotence. ^^ I can't imagine that a god would write something on anyone's tombstone, though, and it sounds like an awfully cowardly way to off someone. o.o

Well that's sort of the whole point. I suppose it's not really a tombstone, but more of just a marker to honor a fallen hero.

So something prickish, then?
This sounds like a good story.