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Anduran artifacts increase stats by 5: armor +5 defense, sword +5 attack, hat +5 knowledge. Together, these 3 artifacts form Anduran combat armor (correspondingly +5 to primary stats, and I honestly don't remember if the armor gives a bonus to knowledge). Maximum luck and morale can be achieved by using Town Portal (not to be confused with returning to the nearest castle; it works like the Earth Expert skill in Heroes of Might and Magic III). You can equip, if my memory serves me correctly, 19 artifacts, because the book takes up 20 slots, regardless of whether it's all 19 swords! That's why I love Heroes of Might and Magic II, but in terms of monster models, it definitely falls behind the first game.