The crown doesn't make you invincible
Ever since the mentor system was introduced, I've encountered a few "mentors" who have been the bane of my White Mage existence.
One recent example, in Castrum Meridianum, a Machinist "mentor" decided he wanted to play tank. He was running around pulling the trash before the tank. I was struggling very hard to heal him, the other healer was only using regen and Medica II the entire time (and using holy too far from the mobs to actually even hit them), and the poor tanks were trying to control the mobs. We almost wiped.
Right before the final boss I decided to stop healing this "mentor" tank-wannabe and let him die. And refused to raise him. The first time I've ever done that.
And I've encountered tank "mentors" in low level dungeons who think they can pull all the trash at once and expect me to heal with 5 or more mobs on them. With only "Cure" and "Medica I" it just isn't going to happen.