I'm building a Transmuter BBEG and I've run into a problem with PAO, namely: How the heck does it work?
When cast on a creature, I gather it works like Greater Polymorph, and would be limited by the constraints of that spell as to what types and sizes it can transform into. Which cuts a lot of utility out of the spell.
What I don't understand is how does it work when you cast it on an object. The spell description specifies the base stats for an object that has none, which I imagine would then be further modified as per Greater Polymorph, so I can change a pebble in to a Medium Red Dragon with rather pitiful stats: Str 14 Dex 10 Con 12 Int 5 Wis 5 Cha 5, 14 AC and only a handful of abilities, pretty weak compared to Summon Monster VIII.
But the big question is: how many Hit Dice would this Dragon have? Objects have hit points, so maybe I can have those carry over (which raises its own problems: Pebble into Dragon - 20 hp, boulder into Dragon - 2,000 hp). But I still need HD for basically everything else.
Any ideas on how to run this? If there's not a RAW answer, House Rule suggestions would be welcome too.
Or maybe I'll just reflavor SMVIII.