I have an NPC that will only be used for the opening quest.

Is anyone aware of a script that would have him leave from the player's sight then vanish?

Thanks!

BTW

I was thinking of using a new cell where characters like this can be held, sort of like what gamesas did for the courier.

But I would still need something to teleport him into that cell once he's out of sight....if that's the best method.

You could register the player for an OnLOSLost event for the character that triggers him to disable.

I looked for "OnLOSLost" in the CK...where do I find that?

The NPC is triggered by his quest when the player enters the room.

You want to do

MyNPC.disable()

The question is, when can you do that when the player cannot see it happen (unless you want him to vanish into thin air in front of the player?)

The way I do it is to ensure that the player cannot be in the area when I do the disable. I do that by making the disable call in dialogue later in the quest ... but it is not critical that I get my stuff to disable immediately.

If it is critical that you immediately disable then you could use:

LostLOS: http://www.creationkit.com/OnLostLOS_-_Form (becareful to register and make sure it is an ALIAS you are disabling ... not an object)
ChangeCurrentLocation: http://www.creationkit.com/OnLocationChange_-_Actor (but if your encounter is near a cell border it may be no good)

So it depends how urgent it is to get rid of your NPC and whether or not you want the player to see it disappear.

You could also tell him to walk somewhere and wait there, around a corner. Then have the script check every once in a while if the player is far enough way to for it not to be possible for them to see the character, then do a Disable().