On a separate question, here, it is agreed that casting giant form 2 on yourself, and then having legendary proportions applied stack, but my question is, what is the total of the buffs? I know size bonuses don't stack, so do you get the +8 to strength from giant form 2, or because you are now gargantuan, do you get a larger bonus? And does this logic follow through on the dexterity penalty, constitution bonus, and so on?
[RPG] Stacking Size effects, what is the total buff
creature-sizepathfinder-1espellsstacking
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Best Answer
Those two spells combined don't increase your size to Gargantuan
Giant Form II is a spell from the Polymorph subschool of magic, which says:
Also, according to this FAQ item, size changes never stack, but this isn't talking about size bonuses, but size changes:
Which means that if one spell increases your size by one step, and another increases it by two steps, you will only increase your size by two steps, never by three. If one spell increases your size from Medium to Huge (like Giant Form II), and another increases your size by one step (like Enlarge Person), your effective size will remain Huge, as that is a largest size changing effect.
There is effectively little difference in the wording on how your size increases between Enlarge Person and Legendary Proportions, so even though all penalties will stack, some of the bonuses will not.
So, the final result will be:
Plus the extra abilities of the giant form assumed, as explained under Giant Form II. So the only real benefit of casting both spells on yourself is the extra Damage Reduction.