Ghost DustConsumable 16
Source Pathfinder Core Rulebook
Price 1,800 gp
Weight negligible
Usage affixed to armor
Activate 
Envision
Trigger You use an action with the move trait
Requirements You are legendary in Stealth
This small vial is filled with a grayish-green dust rendered from dried ectoplasm. When you activate the dust, it casts a 4th-level Invisibility spell on you. This comes into effect before you move during the triggering action.
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.
ConsumableAn item with this trait can be used only once. Unless stated otherwise, it's destroyed after activation. Consumable items include alchemical items and magical consumables such as scrolls and talismans. When a character creates consumable items, they can make them in batches of four.
IllusionEffects and magic items with this trait are associated with the illusion school of magic, typically involving false sensory stimuli.
OccultThis magic comes from the occult tradition, calling upon bizarre and ephemeral mysteries. Anything with this trait is magical.
TalismanA talisman is a small object affixed to armor, a shield, or a weapon (called the affixed item). You must be wielding or wearing an item to activate a talisman attached to it. Once activated, a talisman burns out permanently.