This guarder adds Luck, Critical Chance and DR. You'd think that would make this not great for mages, but you'd be wrong! It has a special feature when casting magic it blends a bit of luck with the guarder's level to boost your spells damage by 100%, 75%, 40%, 20%, 10% or 0%. (0% doesn't decrease damage, just doesn't apply a boost).
Sooleawa:
Cool. Does enchanting it increase the likelihood of the boost to spell damage (how often it triggers) or getting a higher % increase?