The primary antagonist, a shapeshifting ogre who seeks the Field Guide to unleash magical chaos. He kidnaps Simon, breaks the house's protective circle with a potion, and disguises himself as the boys' father before being defeated by Hogsqueal.
Arthur created the guide to document fairies, while Mulgarath seeks its secrets for malicious purposes.
Thimbletack guards the Field Guide specifically to prevent Mulgarath from exploiting its contents.
Mulgarath murdered Hogsqueal's family, driving the hobgoblin to seek vengeance and aid the Grace children.
Mulgarath infiltrates Helen's home by impersonating her ex-husband to steal the Field Guide.
Mulgarath's forces directly assault Lucinda to extract crucial information from the stolen book pages.
Explore the full interactive character relationship map of The Spiderwick Chronicles