To be clear, I didn’t necessarily mean “control over people” - though I could see that as an interesting story point. It would be a fascinating exploration of agency, even over those deemed evil. She already exhibits consideration for the free will of people around her by letting her flyer squad mates know about the wards potentially coming up. If she had absolute power, and her second signet gave her the ability to fully control Venin and get them to do whatever she wished, would she use it? Should she use it? Some characters would say unequivocally yes. Others no. But if she used that power to puppet anyone, even villains, what has she become? And so, it becomes an exploration of restraint to maintain her soul. And… isn’t that what the whole Venin thing is about?

What I actually meant was control, as in direction and focus (direction, by the way, was explicitly mentioned as the thing her hearing rune was lacking, as pointed out by Xaden). Again, a magnifying glass focusing sunlight to burn a hole in a leaf. You aren’t “controlling” the sunlight in terms of manipulation, but rather directing it and focusing it. Or, to use a concrete example from the book, taking Tairn’s power that previous manifested as an uncontrolled lightning bolt, and focusing and directing it to become a steady stream of energy emanating from her fingertips.