Hypersmurf said:
Spells do not function within the AMF. Producing the Effect (like One summoned creature, or An orb of acid) is part of the spell's function.
Ah, okay -- the line "it prevents the functioning of any magic items or spells within its confines". It seems reasonable that a spell "functions" to create its effects before those effects are in place, and that that's prevented by the AMF wording.
If that's the key phrase, though, does that mean that a demon's spell-like ability of greater teleport would work in an AMF? It's not a spell or magic item, and it's a conjuration with instantaneous duration. What about a (Su) instantaneous conjuration effect, if there is such a thing?
It would hang around doing what non-magical lightning does.
A non-magical orb of acid will presumably seep into the ground. A non-magical orb of fire will gutter out for lack of fuel. A non-magical orb of electricity will ground out. A non-magical orb of force will, I would assume, sit there being impervious to just about everything and tripping up passing ethereal filchers.
You didn't mention an orb of cold. I'd say that one is a pretty good argument for why the orbs can't be nonmagical. A 3" sphere of nonmagical cold would have to be cold
something. If it's nonmagical cold air, it couldn't possibly deal 15d6 damage, even if it's at absolute zero. That wouldn't even noticably hurt a child of 1hp.
Orb of sound is also fairly compelling. If you create an 3" orb of sound, there's no way it could travel through the air to its target intact without magic. A 3" sphere of nonmagical compression waves in the air also couldn't deal any significant damage.
There's obviously no reference for what nonmagical orbs of force would do, but here's an interesting thought: If they hang around after the spell, can you use them as thrown weapons or in a large sling to deal force damage? Could you embed them in a stick and make a club that deals force damage?
It's consistent with the spell description and the description of instantaneous conjuration (creation) spells to say that the orb is being continually conjured over the course of its entire flight path (since the flight and impact all happen within the instantaneous duration). That would explain how orbs of cold and sound could deal damage -- at the end of the flight path, the cold or sound are being magically conjured in contact with (or inside) the target's body. After the spell ends, they'd dissipate like nonmagical cold and sound, not dealing any further damage.
IMO, continuous conjuration over the flight path gives a more reasonable explanation for the functioning of Orb spells, I believe it's completely consistent with the RAW, and it would lead to the conclusion that Orb spells can't penetrate an AMF, in the same way that mass cure spells can't.
The reasonableness of it is, of course, a matter of opinion, but do you see anything in that interpretation that conflicts with the RAW?