Along the lines of the magic bonuses referencing LOR, when Gandolf got hit with the flame lash whip from the Balrog on the bridge, he didn't take damage due to magical protection even though all he was wearing was his robes. The magic took the blow even though it strained him to hold up the shield against the force put against it. The drain of the combat was quite evident even though Gandolf never actually took physical damage from the Balrog. So would it be considered that Gandolf took hp hits due to fatigue from the combat (before the bridge collapse) or did he have full hp at the end and only drained of magical energy and in need of rest?
Could be either, or even something different that I can't imagine right now. Maybe, heh. The scene is a lot like the fluff text of a CDT where we can see the cool things that happened without knowing anything about the rolls behind it.One way to imagine it is that he was totally protected by magic, but was exhausted after a while because magic takes a lot of effort. Another way is to imagine that he was protected for the most part, but still lost hit points due to fatigue and could have eventually been too exhausted (low hit points), maybe with a few minor injuries, to properly defend himself and avoid one more blow, which would have actually done serious physical harm.That brings up Layonara magic. As far as I've seen, using magic in Layonara is not exhausting. It doesn't seem to take a lot of effort. A caster can cast three million buffs over the course of two minutes and run off like he just got off the couch. When casters are out of or low on spells, they aren't tired; they just say, "Nope, can't do that right now." So, if that LotR scene was on Layonara, without getting in-depth and considering the nature of protective spells here and whatnot, I would say he was losing hit points.
Another way of looking at it is hitpoints as the ability to avoid going into shock. You aren't bleeding out until you can't stop yourself from bleeding out, after all; when your body has taken so much, or you've lost just enough of that spark that you're rendered helpless and dying.
That brings up Layonara magic. As far as I've seen, using magic in Layonara is not exhausting.
If NWN came with a mana or stamina thing, then it would of course drain from that. But it's NWN, so it doesn't.