Gwen's Spellbook

Gwen's spellbook, or her Grimoire, as she refers to it in Couples Retreat, is a purple and gold miniature spellbook which previously belonged to Charmcaster. Gwen kept it as a souvenir in A Change of Face, something that Charmcaster still hates her for. It was revealed that Gwen brings her spellbook to school, as seen in It's Not Easy Being Gwen, when she pulled it out of the purse she was bringing to school. In Couples Retreat, it is revealed that it was kept on her desk at her house, but later Kevin moved it to a box in his garage for safekeeping.

Spells

 * Acerbus
 * Adfishio Potentia
 * Amorous Infecta
 * Appendage-A Regoria
 * Aquata Risa Spackwata
 * Autem Volton
 * Badickinis Metalalurca
 * Bellum Ocorro Mazzora
 * Botigs Zaborito Carpis Nebegear Gais Liphan Intruders Utien
 * Camera Oblitera
 * Camouphlat Vaporis
 * Corona
 * Declam Baccura
 * Discombobulus Negatum
 * Elota Objectia
 * Estotei Quasai Integumentum Imatari Proximum
 * Fabecio Kai
 * Facio Gravis
 * Fallum Quarca Daminigan
 * Galeas Zipuctus
 * Illuminatus
 * Imperium Im Mentum
 * Incendia Absum
 * Latnica Sorensay
 * Mechanae Discombobulus
 * Mercuta Verditis
 * Nagnisol Amikae
 * Pontum Cartigo
 * Portallus Projectum
 * Reanima Dynamica
 * Reanima Verdanica
 * Rest Ituo Nowitus Wespinaetro Itus Vigoratus Perwita
 * Saphirius Expectorium Perpetua
 * Scribo Iniacendia
 * Segma Sofom
 * Silicus Milez Sasitatio
 * Skadiggeteth Metalarka
 * Stingu Invisibus
 * Tara Tremmo Eradico
 * Tardis Motis
 * Teewat Ligara
 * Thanatis Icatis Exodus
 * Transfera Identica
 * Twista Combititus
 * Unsquiera Despariot
 * Via Esporow Via Esprolixas Capti Capters Few Sonmow Lenton Oway On Respicklas Lokis Lusses Via Astendus Ocultes Ienwuar

Ben 10

 * A Change of Face (first appearance)
 * Under Wraps
 * The Return
 * Be Afraid of the Dark
 * The Visitor
 * Divided We Stand
 * Don't Drink the Water
 * Big Fat Alien Wedding (cameo)
 * Ben 4 Good Buddy
 * Ben 10 vs. the Negative 10: Part 2
 * Goodbye and Good Riddance
 * Ben 10: Secret of the Omnitrix (cameo)

Ben 10: Alien Force

 * The Final Battle: Part 2

Ben 10: Ultimate Alien

 * Absolute Power: Part 1
 * Absolute Power: Part 2
 * It's Not Easy Being Gwen
 * The Ultimate Sacrifice
 * Couples Retreat

Ben 10: Omniverse

 * Mud Is Thicker Than Water (cameo)
 * Charmed, I'm Sure
 * Third Time's a Charm

Cosmic Destruction
The book was seen in Ben 10 Ultimate Alien: Cosmic Destruction, Gwen used it to send Cooper to home with the spell Meven Aweg.

Trivia

 * In the original Ben 10 series, Gwen's spellbook was pocket size. Then in Ben 10: Alien Force, it was huge, and bigger than her hands. In Ben 10: Ultimate Alien, it was pocket-sized again.
 * In the original series and Omniverse, Gwen's spellbook had pictures of the spell, but in Ben 10: Alien Force and Ben 10: Ultimate Alien, it was in runes, which only people with knowledge of magic can read.