Yellows could heal insanity to a degree? Huh... looks like Ardath might have a reason to suffer the patient's rage :P.

"THERE ARE SCORPIONS IN MY BRAIN DEAR SISTER! Buzzing-chirping-pinching-churring-scratching-clacking-chidding-scurrying-scampering and everything in between! And you've not but riled the swarm. Sure they slumber when you heal. But sleeping dogs always awaken, but they come back angrier!"