Entering "Avatar Mode" in Pathfinder?
While Kineticist is definitely THE class that best represents elemental benders from Avatar, another fun aspect of the series I always loved is Aang's "Avatar mode".
For those who haven't watched the cartoon (I can't recommend it enough btw), the "Avatar Mode" is a high-risk, high-reward "transformation" the protagonist (Aang) can assume, becoming a lot more powerful, but partially (or completely) losing control of his actions.
I was wondering what other classes, archetypes and spells in the game can help characters achieve that kind of fantasy, like receiving a power up for a certain duration, but having severe drawbacks or other limiting factors (cooldown or requirements?) that stop them from entering that mode with frequency.
Some classes/archetypes that come to mind for me when I think of that concept are Living Vessel and Cathartic Mage. Psychic also fits that fantasy somewhat, though I feel like the playstyle of the class somewhat requires you to (though carefully) use Unleash Psyche in most, if not all combats, instead of saving it as a last resource or panic button?
In your opinion what are some other features/spells that fit that vibe? Feel free to share any cool stories from campaigns too if you have any :)