I decided to pick up the "What a Rush" Talent for my Rogue. That Talent grants you bonus maximum and turn AP if your health is under 30%. So I had Edward stand in poison for a little bit.
The bonus is a whopping +2 to Maximum and Turn AP. You get that and more from the Rank 1 Fire Elementalist skill Wildfire, which can be used at any time and doesn't have the condition of "anything breathes on you and you die".
Now maybe that +2 AP really makes a big difference, and I will try it out for a while, and it is true that it's making use of something which will happen anyway, but I kinda don't think it will end up being that great a use of a rare Talent point. If it was +4 Maximum/Turn AP, then that sounds more appealing.
It's designed for synergy with a specific character type, which is a revive tank. My tank is pure HP, with Way of Warrior maxed due to +2 on gear so she has some offence as well, but the idea is to just let her get to extremely low hp, then take advantage of my wizard's near infinite AP to kill her then resurrect her to full with Morning person.
My tank has so much HP (3000) that she is below 30% a lot of the time, which stacks nicely with Wildfire and Lone Wolf, and has so much HP that she stays below 30% for a very long time.