Pravuil is a villain from The Keys to the Kingdom series. He used to be a Coal-Collator from the Deep Coal Cellar in the Lower House. Pravuil's loyalty has appeared to change hands many times. After betraying Arthur in Mister Monday, he flees using an elevator, later appearing in Sir Thursday as a Major in the Glorious Army of the Architect. On Superior Saturday's orders, he issues the changes to the Ephemeris of Colonel Trabizond Nage, which begins the New Nithling invasion.