She ambushes them, and she takes Kaulder to the tree's center. Kaulder, and his team of witch hunters who are the early founders of the Axe and Cross Order, tracked the queen to her lair within a giant tree known as the Plague Tree and they tried to kill her. Prior to the main events of The Last Witch Hunter, the Witch Queen released the Black Death (also known as the Black Plague) onto England and soon half of the entire continent of Europe in the hopes of wiping out humanity and ruling Earth.