Suppose you are under the effects of a transmutation effect that affects your physical form (Enlarge or Reduce Person, girallon's blessing, etc.) when you receive the benefits of a polymorph effect (such as Beast Shape). How does the latter spell interact with the former?
Some relevant rules are:
Combining Magic Effects
Spells or magical effects usually work as described, no matter how many other spells or magical effects happen to be operating in the same area or on the same recipient. Except in special cases, a spell does not affect the way another spell operates. Whenever a spell has a specific effect on other spells, the spell description explains that effect.
and
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.
Now, if the spells were cast in reverse order, I would not have any confusion. The first quoted text would apply. A standard transmutation effect can augment your physical form, or whatever form you turn into, but a polymorph effect replaces it rather than augments it, and this is where I am confused. Does it replace even your transmuted augmentations with the spell text? Or does it only replace your base form, and any spell-related augmentations occur on top of that?
Example: You cast Enlarge Person on yourself. Then you cast Beast Shape I on yourself to become a Medium-sized animal. Are you size category Medium or Large?
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You can only be affected by one polymorph spell at
a time. If a new polymorph spell is cast on you (or you activate a polymorph effect, such as wild shape), you can decide whether or not to allow it to affect you, taking the place of the old spell. In addition, other spells that change your size have no effect on you while you are under the effects of a polymorph spell.
Fair enough. What about other transmutation effects? Examples:
Brand - If cast before a polymorph effect, does it disappear? What about if cast after a polymorph effect? Is it suppressed for the duration of the polymorph effect?
Countless Eyes - If cast before a polymorph effect, do your extra eyes disappear? What about if cast after a polymorph effect? Can you be an animal covered in extra eyes?
There are lots of transmutation effects that alter a creature's form in some way. From the response above, I understand that size-alterations are basically moot in conjuction with polymorph effects. But, how do other transmutation effects function? Are they still active? Do they disappear? Does order of spells cast matter? Or do polymorph effects only change the base creature, and any magic exists on top of that?