Arandale Keep

 was a fictional structure created by Jason after he was made Master of the Land of Fiction.

Also known as Vampire Castle by the Adventure Kids, it was a castle near Arandale. After a meteor shower in 1959, the Force was trapped beneath the keep. It was able to possess and influence Phil Chambers over a number of years, finally making him kill people to produce enough energy to free itself. When this finally happened, it exploded out of the ground. The Adventure Kids, who were exploring the keep at the time, were killed by the blast. (PROSE: Conundrum)