Linguist's codex (expanded)
This leather-bound reference tome contains several alphabets used in the various languages of Golarion, along with extensively cross-referenced and indexed words, phrases, and idioms. As long as you speak at least three languages, consulting a standard linguist's codex grants you a +2 circumstance bonus on Linguistics checks when communicating in a language you do not speak.
An expanded linguist's codex has far more phrases and guidance, including instructions to pronounce the sounds in a correct and pleasing manner. These codices provide a +2 circumstance bonus on Diplomacy checks when communicating in a language you do not speak.
- Adventurer's Armory 2
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