The Piercing Rifle is one of the deadliest weapon that you can find in Bloodborne: The Old Hunters. You can only purchase it from the Messenger Bath in the Hunter’s Dream. But in order to purchase it, you must first acquire the Firing Hunter Badge.
From the Hunter’s Nightmare lamp, turn right and head through the door. You must reach at the house where you’ll find a dead old man on the wheelchair. Go through the house and head up the stairs where you’ll find the Central Yharnam lamp normally. But sometimes instead of finding a lamp, you may find a beast mode hunter who can easily kill you with just one hit. To kill the hunter, simply use some fast weapon because you’ll need to deal some instant burst damage before backing away. The hunter is extremely fast so it’ll be difficult if you use a heavier weapon.
After killing the hunter, examine his corpse for the Firing Hunter Badge and you’ll be able to buy the Piercing Rifle from the Hunter’s Dream. Here’s what the description about Piercing Rifle states in Bloodborne: The Old Hunters.
A rifle engineered by the Oto Workshop, the precursor to the workshop of the heretical Powder Kegs.
Designed for hunting on narrow streets, this weapon has been optimized to cause perforation wounds, but is unfit for reliably counter attacks.
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