i think better is to invest in herbal knowledge. in my opinion healing is useless before level 20, cause mystic very fast use spirit on it but take only few HP. better is to invest in health (faster recovery) and agility (less wounds). after level 20 mystic can invest in heal mastery which give better usage healing ability. and like i said, this is my point of view
I think both herbal knowledge and fountain of spirit are really useless skills(unless ur buying aps for diamonds). plus absolutely useles in PvP battles. I think for mystic best invest in heal. After specialise do heal mastery and buff mastery then those increase agility and dexterity of all members..
I have a question does that skill to increase vitality immedialtely increases health unlike when you level up or equip vitality items?? In that case you can do that skiil as well. The strength one and divine bless would be useful only after lvl 30 i guess..
It would be good idea to keep nice mercenaries warriors(defense stance, taunt and guardian would be gr8 for equipping a heavy shield) and rangers(with good dext and critical hit) equip them hammers and crossbows..U can avoid mystics..