That he had killed a witch 500 years ago, the heart of the Queen witch was not destroyed. But people kept because if the heart of the Queen witch is destroyed. Calder's death was followed by the Curse of the Witch Queen. And those that keep the heart of the Queen witch was assistant of Calder's model to model itself. And that a witch can harm the help of Calder's taken it to heart to the queen. To be deployed in the resurrection witch queen. So the Elder must do whatever necessary to help save his closest assistants. And stop plans to resurrect the Witch Queen.