From Inside Book:
Each installment of Pages from the Lost Grimoire provides something new to add to your GM toolbox. It might be a new monster, NPC, city or town, or sub-class. It might be a new set of spells, downtime activities, magic items, or poisons. Whatever it is, the content is intended to be flexible enough to be used by any Game Master, regardless of setting. Additionally, each Page is accompanied by an encounter you can use to introduce the new item to the game world. These encounters are provided in the Dungeons on Demand format.