 A book describing the summoning is sought after by a number of necromancers, intent upon using it along with a necromantic ritual to gain the power of a minor god.Harry summons the Erlking in an attempt to keep him bound and unavailable to lead the hunt until the time for the ritual has passed, but he is ambushed by one of the necromancers and the Erlking set free.When the Erlking launches the Wild Hunt, Thomas gets caught in their path and chooses to join them rather than be hunted.