Spellbook of Redundant EnchantmentEquipment 8
Source Pathfinder Secrets of Magic
Price 420 gp
Weight light
When opening the book, whispers can be heard on the wind, or laughter rings in the distance.
Activate 
envision
Frequency once per day
Trigger You cast an enchantment spell prepared from this grimoire that has no effect because all targets critically succeeded on their saving throws
Effect You quickly divert the failed enchantment energy into yourself to retain your favored spell in place of another. You lose another spell you prepared of an equal or higher level to the triggering enchantment spell but retain the ability to cast the enchantment spell again.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
EnchantmentEffects and magic items with this trait are associated with the enchantment school of magic, typically involving mind control, emotion alteration, and other mental effects.
GrimoireSpellbooks are useful tools for any magic user to write down incantations and runes of power, but where most spellbooks are nothing more than ink on parchment, grimoires have absorbed the magic of the spells within—magic that knowledgeable spellcasters can use to augment their spells.
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.