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Message: <blockquote data-quote="Gantros" data-source="post: 4600833" data-attributes="member: 15836">I agree that the 4 corners of a square are considered part of that square, but a fireball targeted at each corner would produce 4 different areas of effect, each shifted one square in a different direction.You can think of it like this - in theory the fireball can hit anywhere, but for simplicity in mapping its area of effect to a battle grid, we approximate its hit location to the nearest grid intersection.  If the nearest intersection is not the one the caster targeted, then that can be considered a miss, since the area of effect will be shifted from what they intended.  And since a fireball aimed at a location can't miss at any range (unless it hits something first on its way to the target), this gives us a sense of how big an area the caster has to aim at.  (By the way, I just realized I made a slight mistake in my last post... the target area is actually a 5' square centered on the grid intersection, not a 5' diameter circle.)Getting back to the OP's question though, the rules seem clear that if the caster can successfully "hit" the arrow slit with a ranged touch attack, then they can target any location beyond it as if it was a 5' wide gap in the wall.  Treating the arrow slit as a stationary object that is Tiny in size gives it an AC of 5 (10, -5 for 0 Dex, -2 for inanimate object, +2 size modifier).  Spells generally don't have range increments, and the arrow slit's cover doesn't apply since the slit itself is being targeted.Personally, as a house rule, I'd consider adding a range increment (say, 120', giving it the equivalent ranged accuracy of a heavy crossbow).  I'd also consider dropping the -2 for inanimate objects (since it's redundant with the -5 for 0 Dex, which already implies immobility).  That would still result in a seemingly very low AC, but it's the same AC you'd use when trying to hit 3 inch diameter tree trunk with a crossbow, for example.  Arguably the rules make it too easy in general to hit targets at long range with missile weapons, but fixing that would require a fair bit more work.Of course, another reasonable interpretation of the rules would be to assume the arrow slits are designed to be just under 1 square foot in area and therefore block line of effect.  This would make it impossible to cast any spells through them in either direction, and also provide archers with complete protection from fireballs exploding against the outside of the wall.</blockquote>

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