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Message: <blockquote data-quote="SteveC" data-source="post: 1842116" data-attributes="member: 9053">Generally speaking, the "1 foot clearance" rule for line of effect gets a spell caster past needing to make rolls to hit for most spells, since it is reasonable (in my opinion anyway) to cast through allies and assume you can get that much clearance. However, fireball has that nasty line in in that argo quoted: 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. The way I handle it is to make use of the Throw Splash Weapons rules, which have you roll against AC 5. I'd apply the +4 cover bonus if there are characters in the way. Additionally, I still use the 3.0 rules for cover, so I apply the +4 bonus to AC for each character between the caster and the target. If the caster fails his roll, I compare the roll to the touch AC of each target in the way, from nearest to farthest, and if any of the targets are hit, the fireball goes off at that point. If everyone has a good enough touch AC, the missile may still hit the right spot. If the caster can't even hit AC 5, I use the scatter rules to determine where the shot falls. Is that the official way to handle it? As far as I've seen, yes, but I haven't seen any official rules for how it's supposed to work. The result has been satisfactory for my group in any case.</blockquote>

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