Pharros lockstones allow you to open certain areas and manipulate certain contraptions in the game. Merchants sell a limited amount of these items yet they are integral in progressing through the storyline. There are far more Pharros Contraptions than there are lockstones and using them will destroy them.
How can I acquire more lockstones if I have already bought the ones the merchants sell and used them?
Best Answer
In either Doors of Pharros or the well down Majula, if you're summoned as a gray phantom and win, you're awarded with one, so they're pretty easy to farm, since you get summoned super easily in those areas