So Shallan’s big reveal this book was that she had abandoned her oath and killed her first spren. I didn’t think a lot about it until later, but was it ever explained, why did her father never use or sell the shard? Even if he was trying to hide the fact that she had killed her mother, it seems like (especially in the desperate later years) he’d have found a way to leverage such a powerful resource. We know he had it because shallan could always see it behind the painting in the safe where he hid it. Is it still just sitting in the Davar mansion even now?