Girded Metamorphosis: You power your shapeshifting with your own lifeforce in times of dire need.

It's quite an expensive edge and could really be improved. Currently, it would only really 'work' under one circumstance I can think of.

1) You are forgotten and in form. That's it!

Why not make it work if you are out of mana as well. First hour is 50 hp. Second hour 100 hp. Third hour 200 hp. Fourth hour 400 hp. Etc. This would make the edge worth it!

The other Metamorphosis edge for +1 str to a offensive form, or +1 dex to a dodgy form are nice.. Why not make Girded Metamorphosis do something other than.. save you when you run into fungus in form.

Ideas?