This is a updated quick guide to help you efficiently farm blood vials in Bloodborne. Normally gives you around 15-18 Blood vials for a 2-3 min run.
If you are having some issues with some of the enemies try my alternative route skipping the Great bridge part:
Also a thanks to @shadesbelow for his previous comment regarding this route.
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A Blood Vial is a consumable item in Bloodborne. Blood Vials restore 40% of a player's total...