Spurious Book also makes an appearance in the first half of Malebolge in the Abyss of Time, with altered capabilities.
Spurious Book appears in the 3rd and 4th Chapter of the Void Quest in the Midnight Channel. Upon being defeated, they may drop the Paleograph material. Selling 10 Paleographs at Daidara will unlock the Healthy Recipe accessory in the shop's inventory, which helps prevent Exhaustion.
In Golden, it appears on Chapters 2 to 4. It may also drop Olive Stone for trade at Shiroku Pub.
Persona Q2: New Cinema Labyrinth
Spurious Book appears in Aves 2 and 3 of the first Theater, Kamoshidaman. It attacks with Zio and may put the party to Sleep. When defeated, it may drop Scripture Jewel and Scripture Page. Scripture Jewel is used to create the Sleep Sling for Morgana, the Meteorite Katana for Yusuke, and the Eclat Saber for Akechi. Scripture Page is used to create the Spiked Bat for Ryuji, the Unmarked Katana for Yusuke, and the Primary Cat Suit female armor.