Tetrominator

 is a gun that fires random Tetrominos that latch onto enemies. When an enemy is hit by a line piece Tetromino, the line piece will explode: the more Tetrominos are stuck on the enemy at this point, the more damage it deals.

Trivia

 * This gun is a reference to Tetris.
 * The description is a reference to jokes about the line piece not appearing when needed.
 * The sprite is made of Tetrominoes assembled in a gun shape.
 * "LINE PIECE!" is a possible reference to The Tetris God, a skit from CollegeHumor.
 * Its magazine size and max ammo may reference 103/301 well patterns, the likes of which are used in competitive Tetris play.
 * The line piece is, as the gun's Ammonomicon entry states, rarer than the others.
 * This gun was formerly cut content from the alpha.