I have an alt that I mostly don't touch, but because I want the Regalia on her I've been doing some level grinding. Today I did a Brotherhood of Ash repeatable that has you go to spots called tempered ground. You wait and fight a Tempered person. When they're kneeling on the ground you sprinkle what's called sacred ash. It's a failed attempt to try and untemper non Amalj'aa. When you turn in the quest the Amalj'aa says that even though it failed their people won't give up on trying to find something that'll work.

So, I'm left wondering what other most players probably didn't read/pay attention to things that might exist between 2.0 and 3.4/3.5 when we meet GA Bu and then between then and meeting Halric that hint at people trying to work on a possible cure for tempering.

When you use the ash most yell in pain saying that it burns while others ask Ifrit for aid.