Praeden
Explorer
Lord Pendragon said:Why do you say this? Nowhere in the spell description is such mentioned. It claims to be ineffective against huge boulders and siege weapons. It says nothing about magical effects. Fireball creates a small pebble, and fires it at a set point, at which point it "blossoms into a fireball." The pebble can't bypass an arrow slit any more than a non-magical arrow can. Why is it able to ignore a wall of wind?
Last bit first - the two situations are rather different. A gaseous creature would be able to go through an arrow slit, but not a Wind Wall. A catapult projectile would go through a Wind Wall, but not an arrow slit.
Secondly, the spell description is very specific about what it affects. Small/light creatures and objects, gases, and normal projectiles. Everything else is unaffected. So it is quite right to say that any spell which doesn't produce one of the things on the list is unaffected. The list is sufficiently clear that it isn't necessary to list all the things that are unaffected by the spell. The only reason that they specifically rule out large missiles is simply to clarify what is meant by a normal missile.
I think that a glowing bead that shoots from your fingertip and then explodes is sufficiently far from most people's idea of a 'normal missile' that the designers didn't feel the need to include additional clarification. That it can travel more than one thousand feet instantaneously should be proof enough of that. The fact that you sometimes need to make attack rolls for it does not automatically make it a normal missile.
As a happy side-effect, the rulings become a lot easier if you take this view.

This reminds me of a similar ruling I was once asked to make. I might start another thread, see if we can turn this into a regular feature!