Wrythk

The Spirit King Wrythk was a wrathful entity from the Neazzarack Realm.

In that world, Halloween was not an occasion for celebration of “a time of great fear and terror” because it was the time Wrythk “perform[ed] his annual ‘returning-from-the-Underworld-to-wreak-havoc’ party piece”. (PROSE: The Ghosts and the Machine)

Century Smith once swore “in the name of Wrythk”. (PROSE: Century Smith and the Time Terror)