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I put on something with Knowledge, jump into a well, then change clothes.
I noticed that if you spend the night in a town, your mana refills to the max in the morning. So, you put on all the Knowledge artifacts, spend the night in a town, and in the morning, your mana is at its maximum.
Or am I mistaken? Or does this trick only work at the beginning of a new WEEK? A VERY important question. ;)