So yeah, I have posted about this character before in the past few days but I am working on a character with the ability to cast both MP1 and Enlarge Person.
If I am medium sized and I change into a medium size Deathsnatcher, can I then become a Large Deathsnatcher through Enlarge Person?
I am aware that sizes from polymorph spells don't stack. But this is slightly different....
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As a GM I would question how a 5th level caster has an unlimited number of pieces of a CR 18 creature in his spell pouch, but RAW you would have them.
If you are medium-sized at the start Monstrous physique doesn't change that and it doesn't change your type, so you can use Enlarge person.
Keep in mind that most of the creature damage comes from its strength, magic, and feat and that for the poison you need Monstrous physique III.
So it becomes:
Damage Melee bite 2d6+your str bonus, 4 claws 1d8+your str bonus, sting 1d6+your str bonus
It loses a lot of oomph.
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Hahaha yeah I guess that would be a bit weird. A black market for component material monstrous body parts comes to mind. So one slain Deathsnatcher is cut up into a thousand tiny pieces to serve as Material Components.
And nice to know that at least RAW it should work.
What about the Euryale, do I get the six bite attacks? Because those are mixed up in a Extraordinary ability...
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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.
Enlarge person doesn't work because of the above quoted line from the polymorph rules.
It doesn't matter that Monstrous Physique 1 doesn't change your size, other spells can't while you're under a polymorph effect.
I mean, I think the answer if you really want to get there (and are okay with home brew) is to create higher level versions of the spells that enable you to get to those larger and smaller sizes than the current spells allow.
A Form of the Dragon 4 spell as a 9th level spell that let you become a gargantuan dragon would be reasonable, depending on exactly what all bonuses it provided.
To me, this sort of solution of extending existing spell lines and coming up with reasonable bonuses makes more sense than ignoring the restrictions of polymorph rules, because otherwise you can get some really weird shenanigans.
I don't disagree. My group is always comfortable with home brew, but I'm enough of a straight laced type that I'm always hoping/searching for a "legitimate" way to get to the goal.
Well, since Paizo isn't supporting PF1 anymore I would hazard to say you will never achieve such a goal.
At this point, if it was possible I think someone would have found it.
The closest thing I know about (for small size stuff) is the songbird of doom build, it becomes a tiny sized bird but does so through a magic item.