"Then carve the tool you have been given. She could be of serious use to us. Play the game until she is ready to spread her wings and take the Dark Mark. Once she does there is no going back, you will have made an ally. You would have created a monster in Potter's eyes." Bellatrix's eyes shot wide open, like an amazing idea had just occurred to her. She darted out of the room with no further conversation, leaving her younger sister stood alone.