The issue with Constitution is that from a game design standpoint constitution is basically benefiting the players twice over.
You could NEVER make a well designed character with just dex, or just str, or just intelligence and the way the other skills are designed.
Yet with constitution being the chief attribute governing Polymorph it becomes, to quote myself, "Too good". You would never need to put a single point into anything else creating an indestructible character who is the master of their craft.
It would need to be balanced with care, however consider this: someone who puts points into
only CON would only be able to be a good single-classed Polymorpher.
Perhaps a limit should be put in place as to how effective stacking massive boosts to CON is for that class. Dr Koin's idea of Polymorpher abilities being cast from hit points is an interesting one. If used it should be a percentage-based cost to HP though, to allow for hybrid polymorpher builds.
(I don't like the idea of a skill which leaves you at 1 HP for turning your skin into an "almost" impenetrable carapace though. That's either too good or too useless.)
Can you at least agree that Strength is a better idea then Intelligence?
I'll concede that, sure.
