Hidden Immunity Idol

The Hidden Immunity Idol (also known as the "Hidden Idol" or simply as "the idol") is a pocket-sized talisman, and is widely believed to be the most groundbreaking twist ever to be created on Survivor. Its purpose is to, one way or another, prevent the user from being voted out in a Tribal Council vote.

Overview
The Hidden Immunity Idol negates votes against the holder during tribal council. Despite its potential to protect its owner in the game, it may only be used once, after which the idol will either be re-hidden or discarded. With this, owners should be careful about divulging information about possessing one and/or when to use it as a player can still be eliminated with the idol in their possession, thus going home bringing their idol with them. Another limitation is that the idol is only valid until a given deadline (usually Day 36 or 37, when 6 or 5 players are left). A player may hold more than one idol if available.