Towo
Towo is an unknown creature's name from a very old tale who visits people that seek to master a specific skill. Towo offers them to help master chosen skill within a very short time but in exchange they will not be able to learn any other new skills. In this tale characters agree to never say this name out loud as it will come to listen and instead refer to the creature as "The one who offers".
I accepted Towo's offer and now I can draw anything from my imagination flawlessly but it's been years since I tried to learn to make pancakes and I never got even a slight hang of it. At least I still get to make my favorite cheesecakes that I learned to make before I accepted the offer.