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Message: <blockquote data-quote="Greenfield" data-source="post: 6073622" data-attributes="member: 6669384">If I were the player, I'd argue that they have Improved Cover against attacks from outside the tower.  That is, ray spells, missile weapons, etc.  Presuming that the Ranged Touch attack hits to thread the needle of that arrow slit, the Fireball is "attacking" from within the chamber.  The Improved Cover supplied by the outer walls doesn't apply.Hitting that arrow slit is a bit harder than someone else suggested though.  It's a base DC of 10, and a size modifier for a Tiny arrow slit.  That is, you aren't just trying to hit the square, which would be AC 5  (10 base -5 for the utter lack of Dex that most towers suffer.)  You're trying to hit a Tiny target that is effectively inside the tower wall.  Specifically, the wall isn't zero thickness, and you need to hit not just the outside of the arrow slit, but the inner opening as well.Think of a certain Jedi pilot shooting at a cooling vent:  He hit the vent with one of his shots, but it hit the inside of the shaft and detonated early.  He heeded to hit the *bottom* of that shaft.As for what happens if he misses:  By the rules it hits the wall and detonates outside.  If that happens, while the fire will pour through that opening, everyone inside will have their Improved Cover against it.Also, figure that if it's an arrow slit then there's an archer inside ready to go ker-thunk into any spellcaster who lines themselves up so they can make that shot.  If the caster isn't in direct line with that opening, they have zero chance of shooting through it.  Like I said, the walls are more than zero thickness.  So plan for the Ready Action shot to ruin the spell caster's day.</blockquote>

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