The Box of Health is a treasure chest found at the end of the third level of the Stronghold of Security. Like the other treasures found in the stronghold, the Box of Health contradicts the theme of the floor, which is Pestilence.
Once opened, the portal near the entrance can be used to reach the end of the level. When opened, the player will receive 5,000 coins, the ability to use the Idea emote, and will have all stats including hitpoints, prayer points and strength restored.
A player may only open it if they have enabled the 2-factor authentication system for their account, and it cannot be claimed more than once per account.