Existential gun

The existential gun is a weapon from the IDW portion of the Generation 1 continuity family

The existential gun is an experimental type of weapon developed by Brainstorm.

Fiction

2005 IDW continuity

At some point during the quest to find the Knights of Cybertron aboard the Lost Light, the luckless Pipes was shot by Brainstorm's existential gun, leaving him with a dose of ennui that nearly caused him to shrug himself to death. Cybertronian Homesick Blues