The bravery potion is made during the Legends' Quest, and is used to get a player to overcome the fear of a dark cave found by the dried up pure water source in Kharazi Jungle.
To make this potion, players will need a vial of water, one ardrigal, and one snake weed. Although 45 Herblore is listed as a requirement for Legends' Quest, it is not required to make the bravery potion.
Players are only able to make this potion once they have reached a certain point in the Legends' Quest. The potion can still be made after completing the quest, however it has no uses other than for the quest. Players will be asked before drinking the potion if they want to drink it.