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I don't remember if it was said in this thread or not, but it was mentioned that instead of leveling up Leadership and Luck, it's better to equip artifacts, because leveling up (spending skill slots) on skills that can be removed by other artifacts...
You just usually have to choose a skill first...
so why take up 4-5 artifact slots for Morale and Luck when there are more useful artifacts that can be put in those slots... such as magic books and others...