- So take him! Tear him apart! And keep the bones for yourselves!
- — The Dealer src
The Black Mirror
Guiborg first attracts Batman's attention when his sold weapons are involved in a series of murders across Gotham City. Batman disguises himself as a member of the Dealer's dark cult and infiltrates Mirror House, where everyone is required to wear a gas mask. The Dealer immediately exposes him with a sabotaged mask and drugs Batman with hallucinogenic nerve gas. The entire house are commanded to tear Batman apart, and he barely escapes through the violent hallucinations. Batman ambushes the Dealer again on a flight leaving Gotham. He ingests Man-Bat serum to turn himself into a monster, but Batman still beats the crap out of him and the plane goes down during their fight. There's a massive explosion, but the Dealer's body isn't found in the wreckage and he might have escaped. It's later revealed that he was assisted in his Gotham plans by James Gordon, Jr..
- Dick Grayson mentions that "Etienne Guiborg" is probably an alias, as the real Étienne Guibourg was a 17th Century priest in France convicted for leading black masses. This means the Dealer is either using an assumed name or his origins are supernatural.
- 3 Appearances of Etienne Guiborg (New Earth)
- 9 Images featuring Etienne Guiborg (New Earth)
- 2 Quotations by or about Etienne Guiborg (New Earth)
- Character Gallery: Etienne Guiborg (New Earth)