Thinking was difficult. Well, no. Thinking was easy, my brain would not stop, but concentration and focus were entirely lacking from the process. My mind jumped from one memory to the next, to wanting a drink, to hating my captives, to hating my father, to resenting myself for putting myself in this position. Settling on anything concrete and using reason to move forward was impossible, yet something good came of the day. Remembering Jocasta's question I cast a cantrip, removing foreign matter from my teeth. It worked. So I had eight useless cantrips up my sleeve, and clean teeth. Wonderful. I didn't know a single useful spell and the stone in my forehead was no good for much more than what little I did know. There was no doubt about it, my father was right. I was useless.