I am trying to make an alternative magic system closely modeled after the psionic powers system and making heavy use of augmentation. And now I am dealing with making a low-ish level polymorph spell.
The Metamorphosis power is already designed for power points and augmentation, but it seems considerably more open ended than the Alter Self and Beast Shape. And that seems to be one of the main reason that makes most spells way too good and versatile, with polymorph effects being particularly notorious.
I think with beast shape, I would be playing it relatively safe. But metamorphosis is much more flexible. Does anyone have experiences with these and can tell me something about how much more powerful the metamorphosis powers are in practice?