I'm trying to make a hostile NPC is that is up on a ledge, shooting down arrows. I want him to have infinite ammo while in combat, but not give the player infinite ammo when they loot the body.

I tried giving him -10 arrows, but it doesn't work. Owning a container containing -10 arrows also doesn't work. But he does look cool shooting http://planetelderscrolls.gamespy.com/View.php?view=mods.detail&id=4926 out of the dark.

Do I need a script attached to the NPC to refill his ammo? Can I get him to refill his arrows when he runs low and only have the script run during combat?

I'd like to get him to summon a creature down on the level of the player, but I don't see a way to do that either.

Summoning on target will be a little bit more difficult, take some fun scripting.

For the arrows, just do a basic script like:

if ( GetItemCount "arrows" < 10 )    AddItem "arrows" 10endif

That'll give him infinite arrows. You can set it up to only run at certain times, or disable after the player kills him or something, to help with balance.

Thanks! That helps.