Flash heal is a fast casting, medium healing spell. It is less mana efficient than Greater Heal, but can be more effective in situations where damage fluctuates.In the end game raid instances, Flash Heal will be your primary healing spell in most situations, combined with Renew. Critical hits and monster damage at that level is so high that tanks can die before a Greater Heal can be accomplished. 4story Gold players should also use this heal on any other cloth wearers in your group.Force of will is a good talent for soloing Discipline-heavy priests, but not really worth the talent investment. If it were lower down the tree it would be more useful, but having it so high means that it costs at least 30 talent points to be able to max it, talents which could be better spent elsewhere.If you really need damage boost and have no where else to spend the points, get it. Otherwise, ignore it.