I am not going to go overboard, I just want to increase my magicka by 100 so I can have a bit of fun with spellmaking. the spells I will use won't even make me more powerful, really, they will just be entertaining mostly.

Anyway, can someone remind me how to increase my magicka with this cheat? I remember something about getting the right stone, duplicating it, or a ring, or equipping a ring, or something. I forget.