The Explosive Pen is a universal detonator, capable of sensing and detonating any bomb within it's scanning range. It comes with a pack of stick-on "eraser-like" detonators that, when placed on something explosive, can be triggered by clicking the top of the pen.

Steelheart Edit

Main article: Steelheart (Book)

When the Reckoners visit Diamond, the team decide to buy the Gauss Gun with Fortuity's body. David Charleston throws the pen into the deal and Diamond reluctantly agrees.