Vanishing Coin
Item 10ConsumableIllusionMagicalTalismanSource Core Rulebook pg. 569 1.1Price 160 gp
Usage affixed to armor
Activate 
envision;
Trigger You attempt a Stealth check for initiative, but you haven't rolled yet;
Requirements You are a master in Stealth
This copper coin dangles from a leather strip strung through a hole drilled in the center. Until activated, the coin becomes invisible for a few seconds at random intervals every few minutes. When you activate the coin, it casts a 2nd-level
invisibility spell on you, lasting until the end of your next turn.