Held on Day 38 (Day 41 in Survivor: The Australian Outback, Day 37 in Survivor: Kaôh Rōng), it is the last Immunity Challenge of the season, and guarantees the winner a seat at the Final Tribal Council. It also gives the winner an advantage in selecting their rivals for the Final Tribal Council. This is particularly true of seasons featuring a Final Two, as the challenge winner is the only person to cast a vote at Tribal Council. The challenge type has varied throughout the series' run, but is typically an endurance challenge, requiring the contestants to literally outlast the competition.