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<blockquote data-quote="Vegepygmy" data-source="post: 4597812" data-attributes="member: 40109">The fireball spell description says: &quot;If you attempt to send the bead through a narrow passage, such as through an arrow slit, you must &quot;hit&quot; the opening with a ranged touch attack, or else the bead strikes the barrier and detonates prematurely.&quot;&nbsp;Spells do not use range increments. If you have to make an attack roll with a fireball, you're either &quot;in range&quot; (no penalty) or not (just can't do it, period).&nbsp;AC of an object (or opening) is 10 + its size modifier + its Dexterity modifier (usually -5). An inanimate object takes an additional -2 penalty to its AC. See &quot;Smashing an Object,&quot; PHB page 165. See also Table 7-1 (Creature Sizes), MM page 314.&nbsp;So a typical arrow slit (say 2-3 ft. high) is probably Small in size (+1 AC), maybe Tiny (+2 AC). Its touch AC will thus be about 4 or 5.&nbsp;A fireball &quot;hits&quot; anything in its area of effect. If the caster chooses the right grid intersection (see &quot;Aiming a Spell,&quot; PHB page 175), he'll &quot;hit&quot; the right targets. The melee line is irrelevant, since it does not block line of effect or create a sufficiently narrow gap to force an attack roll (see above).</blockquote>

[QUOTE="Vegepygmy, post: 4597812, member: 40109"] The [I]fireball[/I] spell description says: "If you attempt to send the bead through a narrow passage, such as through an arrow slit, you must "hit" the opening with a ranged touch attack, or else the bead strikes the barrier and detonates prematurely." Spells do not use range increments. If you have to make an attack roll with a [I]fireball[/I], you're either "in range" (no penalty) or not (just can't do it, period). AC of an object (or opening) is 10 + its size modifier + its Dexterity modifier (usually -5). An inanimate object takes an additional -2 penalty to its AC. See "Smashing an Object," PHB page 165. See also Table 7-1 (Creature Sizes), MM page 314. So a typical arrow slit (say 2-3 ft. high) is probably Small in size (+1 AC), maybe Tiny (+2 AC). Its touch AC will thus be about 4 or 5. A [I]fireball[/I] "hits" anything in its area of effect. If the caster chooses the right grid intersection (see "Aiming a Spell," PHB page 175), he'll "hit" the right targets. The melee line is irrelevant, since it does not block line of effect or create a sufficiently narrow gap to force an attack roll (see above). [/QUOTE]

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