Pharros' Contraption

The Stone wall faces can be located in a certain areas of Drangleic, this Faces can be activated by using a Pharros' Lockstone.

General Information
When this faces are activted they can lead to treasures, hidden paths or even activates traps (for now only known place is Grave of Saints, but these traps can serve to kill Grey Phantoms, or even invadres), also they can be named Pharros Mechanisms (But maybe both aren't its real names).

Locations

 * Grave of Saints: There is a total of eight stone wall faces, where two activete two bridges, one activates a waterfall that can be used to confuse a invader and five activates corrosive liquid traps, they are located in all the area.
 * Forest of Fallen Giants: There is only one stone wall faces, it can be located in the room below the giant crossbows.