The bravery potion is made during Legends' Quest, and is used to overcome the magical fear that blocks access to the dark cave in the Kharazi Dungeon. A player only needs to drink this potion once to gain unlimited access to the dark cave.
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 learned how to do so during Legends' Quest. The potion can still be made after completing the quest, but has no uses aside from the quest. Players will be asked before drinking the potion if they want to drink it.