"Oh," Katherine turned around. "Great-grandmother? Grea-anny?" She shrugged. "I would just ask her." Katherine had gotten used to calling her grandma in her head. Her father called her that in front of her but addressing her like that felt wrong. Very wrong. They were in a different league, even though Kat knew deep down that her grandmother would have none of that.
"As for the stones... there are six of them in your ancestors' universe. They were there since the beginning of them. If you have all of them, you have the power of the universe. You could do literally anything. So far, we have two."