Arc Pylons are a lethal defense technology utilized by the City Watch in Dishonored. They work similarly to Walls of Light but are effective at a distance, disintegrating anyone within range that they have not been configured to recognize. They can be hacked by Corvo Attano to ignore him and turn against the Watch instead.They use whale oil to power the pylons, meaning these weapons can be disabled if Corvo pulls the oil tank out of the power module.
The arc pylons are the brainchild of Anton Sokolov. In cooperation with Sokolov, Piero Joplin perfected his own version of the device, which can be used at much greater range (at the expense of requiring more fuel) to kill or incapacitate. This can be used to great effect during the mission, The Loyalists, to eliminate all of the guards in the mission area while remaining undetected, making the mission much easier to complete.