Can produce Magic Cores

So you began sharing your research on the nature of Souls and Circuits with Touko, and she proceeded to get incredibly excited as you demonstrated that specific organs might have potential for usefulness when reproduced spiritually. And so you tow began testing a wide variety of organs: muscles were an utter failure for producing prana, as were veins and the mouth. It was when you two were near your wit's end that you considered lungs, and Touko's knowledge of Dragons helped you figure out exactly how to structure it. The result...was a Magic Core. Limitless prana produced with every single breath. Not quite Dragon quality, but still immensely powerful. (Can now produce Magic Core: effectively infinite prana with every breath! Touko hasn't stopped cackling for the past three days. It's seriously starting to be a problem, she's bruised her diaphragm and is getting dehydrated.)