"Denizens of Verekna contains a monster folio with more than 50 loose-leaf pages of new monsters from the demi-plane of Verekna including complete entries for the Marshals, Governors and Generals of the Prince of Deception and a summary of the various Thanes and Lieutenants who serve them.
"In addition [...] feature the Grey Grimoire, a compilation of special spells employed by the most powerful wizards of the Infernus."