A cylinder-like 振動子, or strange 機械的な魂 of the 死んだ. Packed like oil-souls underground, the 死んだ welcome 機械的な release and chemical processing that eventually turns them into gas-station gas (exploding and propelling the engine of this story). ジェイコブ is part of a larger scheme to find the proper technology to harness the residue power of the 死んだ (their faint breath, and ability to push things over) for practical purposes.