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TRANSFIGURINE
School transmutation; Level sorcerer/wizard 4
CASTING
Casting Time 1 standard action
Components V, S, M (25 gp of ivory or jade)
EFFECT
Range touch
Target one willing creature of Large size or smaller
Duration 1 day/level (D)
Saving Throw none; Spell Resistance no
DESCRIPTION
This spell transforms a willing creature into a Fine figurine that resembles the creature. The figurine appears to be made of ivory or jade, depending on the material component, but a DC 10 Appraise check reveals that it is not the real thing. The figurine has the same hit points as the creature and hardness 5. Any damage inflicted on the figurine breaks the spell.
The idea behind this spell is that it can be used to allow a paladin to bring their mount along even when this would be impractical. It could also be used to smuggle a party member into a secure area disguised as a knick-knack. Do you think the parameters of the spell are reasonable?
I think the spell is good as a concept, but better as a magic item than a spell. It's not like the paladin is going to be able to cast it himself.
If the knick-knack can see and hear what's going on around it, and can end the magic when it wants to, what you're looking at is some combo of Statue and Shrink Item. If the subject can't sense what's going on or end the magic voluntarily, then Flesh to Stone and Shrink Item.
I'd say make it some sort of jade powder to be sprinkled over a subject and make vague references about there being ivory and silver variants.