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 
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- 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.
