Elixir of Chameleon PowerLevel 8 Uncommon

Once consumed, this clear liquid lets you blend in with your surroundings.

Consumable: Elixir        125 gp

Utility Power (Illusion) Consumable (Minor Action)

Effect: You drink the elixir. Once before the end of the encounter, you can use a minor action to change your color and tone to blend in with your background. You gain total concealment until the end of the encounter, until you attack, or until you are not adjacent to a wall or another object at least as large as you.
    While under this power’s concealment effect, you do not take the penalty to Stealth checks for moving.

Published in Mordenkainen's Magnificent Emporium, page(s) 91.