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From Pathfinder #200: Seven Dooms for Sandpoint, which isn't enabled.

Liar's Lexicon

ITEM 10
Price 1000 gp
Bulk L

The covers of this book are bound in scratchy, purple leather—hide harvested from a mind-manipulating wormlike monster known as a seugathi. The margins of this grimoire contain hundreds of tips and notes to avoid having your lies discovered. When you prepare spells from a liar's lexicon, you gain a +2 item bonus to Deception checks to Lie.

Activate envision (spellshape)
Frequency once per day

Effect If your next action is to cast a spell that has the emotion trait, your skill at manipulation and exploiting emotion enhance the spell. The spell gains the linguistic trait. Attempt a Deception check to Lie as you cast the spell against the Perception DC of all those observing you. Those you succeed against think you were merely talking, not casting a spell on a creature.
Pathfinder #200: Seven Dooms for SandpointOGL