Cobalt Hammer

 is a gun that fires piercing blue lasers. When fully charged, the Gungeoneer will strike the gun against the ground, damaging all enemies in a short radius and firing lasers in four to five directions which can electrify water.

Trivia

 * This gun is a reference to the streamers Cobalt Streak and Richard_Hammer, who before the release of Enter the Gungeon were known for playing The Binding of Isaac, another shooter rogue-like. They were also known to "break" games or exploit game mechanics to a ridiculous, often beneficial degree.
 * The item description refers to their several day long stream leading up to Enter the Gungeon's release, where the two would take turns streaming and sleeping.
 * The thunder effect and sound are a reference to Mjolnir, the hammer used by the Norse God of Thunder, Thor.
 * When firing a charged shot with an item that increases amount of bullets fired (example: Scattershot) the ammo usage per shot also increases.