Well I found similar as some have said: The health seems surprisingly low on some bosses or enemies but they never seem to take damage and sure hit hard and often.
For this reason especially on collection quests in which I can only fight 2 at a time but might have to fight several times, I was using hench to help me out. My wizard was 'getting slaughtered.'
It's costing me a lot to get through Mirage as a result. When I hit max I decided to give questing a break for a while. The points won't count until max level is raised anyway.
Now I am going back through and doing things like fishing or crafting, which was always penciled in back of my mind for when I had finished the levels, or needed to coast.