I believe the halfling should be able to hide behind a hidden creature but not an invisible one.What happens if a wood elf hides in light foliage, and a Halfling then hides behind the Elf?
Huh? [MENTION=23751]Maxperson[/MENTION], [MENTION=6787503]Hriston[/MENTION] and I were discussing the capacity, in Chainmail and 1st ed AD&D, of elves to become invisible - because this is the precursor, in the game, of Mask of the Wild. That was the context in which Maxperson denied that a Fireball spell counts as an attack. And you stepped into that discussion.
And more generally: the thread is at nearly 600 posts. You shouldn't be that shocked if some of the aspects of the discussion have strayed from what you would regard as central to the issue!
I think this is the bit that I couldn't find when I was looking for it a couple of months ago!
There is no such idea in existence. At least not in the rules. An elf can go "invisible" and not move from that spot. A fireball can be cast at or near that spot.
Mini game rules are designed with different goals than RPG rules. Something that makes sense in a miniatures wargame(can't attack an invisible target), no longer makes sense in an RPG and is changed.
So you're claiming that a fireball or cloudkill spell cast 5 feet from an invisible elf misses because the elf is fast?
Only if the elf is invisible but not hidden, as per the DMG passage I've already quoted up-thread: "[Invisible opponents] can only be attacked if they are attacking or otherwise detected somehow." I thought you agreed that casting fireball is attacking.
Except that it doesn't change between Chainmail and the DMG. You still can't attack an invisible and undetected (hidden) target, as it says in the rule I've quoted twice now.
No, I'm saying that an invisible and undetected creature cannot be attacked. There is no contingency for guessing in AD&D.
You failed to prove anything other than in melee combat they can't be attacked.
Spells are not a part of melee combat.
Also, fireball is an "attack", but not an attack. The quotes mean that it qualifies for things like invisibility which refer to anything hostile and dangerous, but not for melee combat which is specifically called out by invisibility.
Consider the following situation. 6 elves are attacking a fighter/magic user and are unaware of the magic user part. They retreat back to a tree and fade from view while being observed. The fighter/magic user still being in combat lobs a fireball at a point near the tree. A second later a ball of fire blossoms and we now have 6 dead elves, nice and crispy. Combat is ended at that moment and not before.
Quote something other than melee combat rules will ya? Melee combat rules don't apply to spells and never have.
Sure there is. From the 1e PHB.
"The magic-user points his or her finger and speaks the range (distance and height) at which the fireball is to burst. A streak flashes from the pointing digit and, unless it impacts upon a material body prior to attaining the prescribed range, flowers into the fireball."
There is no requirement that it target anything. The magic user is allowed to guess anything he wants prior to picking the distance and height.
Sure they can, they can be blindly attacked. Of course, the elf's only going to be hit if it is in that spot (assuming open hand doesn't require a visible target specifically).Yes, the same as if the monk tries to open hand attack a spot where she thinks the elves might be. Without detection the elves cannot be attacked.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.