Chameleon Armor

Chameleon Armor refers to two suit of armor armor made by Beckendorf and the Hephaestus cabin. It blends in with its surroundings. Percy and Beckendorf used it in Capture the Flag in The Bronze Dragon. It doesn't give you true invisibility, but it comes close as it can change the color of the armor to match the exact color(s) of the background. It has only been used in The Bronze Dragon, but Rick Riordan has hinted it could be used in The Son of Neptune, coming in October of 2011.