I'm not certain what you're going for. Calling down a bolt is a standard action in either case.
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As blahpers said, each round you can call down a bolt from one of the spells you have running. The bolt does either 3d6 or 3d10 damage depending on the weather conditions. The only benefit you'll get from casting two of them at once is that you won't have to cast for a full round again to get another 10 bolts.
Now that's a question..... ARE there actual rules on spell stacking at all? Regardless of it's "Practical" intent?
Eg.... I cast Bull str twice on my barbarian, they will only get a single +4 str (enh bonuses don't stack), but do I now need to dispel it twice to get rid of it?
Maybe a better example of something you might actually want to do is False Life. +Temp HP while in effect... Greater doesn't stack with lesser, but.... If there's no rules about spells not stacking with themselves, you would be able to argue that RAW you stack them as many times as you want.... Good luck with that at my table, but there's a case there.
Yes, there are rules on spell stacking on CRB p208-209.
Stacking Effects: Spells that provide bonuses or penalties on attack rolls, damage rolls, saving throws, and other attributes usually do not stack with themselves. More generally, two bonuses of the same type don’t stack even if they come from different spells (or from effects other than spells; see Bonus Types, above).
Different Bonus Types: The bonuses or penalties from two different spells stack if the modifiers are of different types. A bonus that doesn’t have a type stacks with any bonus.
Same Effect More than Once in Different Strengths: In cases when two or more identical spells are operating in the same area or on the same target, but at different strengths, only the one with the highest strength applies.
Same Effect with Differing Results: The same spell can sometimes produce varying effects if applied to the same recipient more than once. Usually the last spell in the series trumps the others. None of the previous spells are actually removed or dispelled, but their effects become irrelevant while the final spell in the series lasts. One Effect Makes Another Irrelevant: Sometimes, one spell can render a later spell irrelevant. Both spells are still active, but one has rendered the other useless in some fashion.
Multiple Mental Control Effects: Sometimes magical effects that establish mental control render each other irrelevant, such as spells that remove the subject’s ability to act. Mental controls that don’t remove the recipient’s ability to act usually do not interfere with each other. If a creature is under the mental control of two or more creatures, it tends to obey each to the best of its ability, and to the extent of the control each effect allows. If the controlled creature receives conflicting orders simultaneously, the competing controllers must make opposed Charisma checks to determine which one the creature obeys.
No, you cannot stack the same spell's temporary HP bonuses. However bonuses from different Temp HP sources stack. FAQ
- Gauss
wow I refreshed and deleted pretty much every thing Gauss just put :l
Sorry dark78660 :)
- Gauss
No, because the call lightning effects are not free applications of damage. You have to use your Standard Action to bolt someone. If you have used your standard to call down a bolt, you do not have the action left to cast a different spell to 'stack' it. (unless it's quickened, or what-have-you.)
Even if Call Lightning were quickened it would not change the standard action to bring a lightning bolt down each round.
So no, you cannot summon two lightning bolts per round unless you somehow have two standard actions per round (such as burning a Hero Point if using that optional system).
- Gauss