Old Yharnam
Make your way to Old Yharnam (out of the left door from Cathedral Ward, stay left, go around to the left, kill the dogs and huntsmen, go up the stairs, pull the lever, go down the stairs, keep going down, open the large set of doors), you need to find and take down Djura, the NPC firing the gatling gun at you. To find him, go around to the left, across the bridge, stay in cover whilst taking out the enemies so Djura can’t hit you, keep going through the area, then head right when you can, there is a very powerful enemy down here so watch out for it, go around to the right of the building, you will find a ladder, go up these ladders then take Djura out, if you do knock him off the edge, warp back to the lamp then come back to the platform where you fought Djura to find the Powder Keg Badge. This Badge will allow you to purchase the Rifle Spear (4000 blood echoes) from the bath messenger in the Hunter’s Dream