So I'm trying to disenchant some adept robes of conjuration, which decreases conjuration magicka by 17%, and will increase my magicka recharge by 100%. The only problem is when I try to disenchant it, it says that the enchantment is already known. I look in my enchantments and the closest one is one that increases by magicka recharge by 10%, and decreases conjuration magicka needed by 1%... even with a grand soul gem.
Help?
Right you already know the effects on the robe, when you learn the effect you learn how to do it up to your skill level in Enchanting. So to make better enchantments, like to be better at anything else, you have to invest time and perks into the skill.