Any class with "Tough transformations"?

[Azullius Koujou]

I mean as in transformations that are hard for the player to control, like Bruce banner getting angry and turning into the hulk against his will.
Or a class that transforms once it's at low HP, etc.
Or even a class requiring a DC roll to access your transformation?

Another question.
Are there something along more powerful transformations that either last much shorter or who require a very long cooldown time(such as a week between transformations or something like that)? (Though i suppose expensive materials for a potential spell could also quallify)

thanks in advance

[Avoron]

Wild Rager might be something like what you're looking for, at least for the first question.

[My Self]

Look at the Master Chymist Alchemist PRC.

[Liegence]

Abomination Psychic!

[Azullius Koujou]

thanks for the suggestions