Found in the Irithyll Dungeon, on a draconic statue looking out beyond the cliffside and performing the "Path of the Dragon" gesture. This is the same spot where the player may use the gesture to gain access to Archdragon Peak.
Upon activation, the player's torso mutates into a dragon/humanoid hybrid form, allowing them to perform a dragon's roar. This transformation is irreversible until death.
Additionally, the player gains the following bonuses: