Bloodborne is a Souls-like action RPG developed by FromSoftware and published by Bandai Namco. The game is set in the world of the Dark Souls series, and revolves around character growth and combat. One of the game’s main mechanics is the use of blood vials, which can be used to heal yourself or your allies. To farm blood vials, you will need to find them scattered throughout Bloodborne. They are usually found in dark areas or in places with high concentrations of enemies. Once you find one, take it to a nearby altar and use it to create a blood transfusion. This will allow you to heal yourself or your allies for a short amount of time.