The "Laser Light Cannon" is a powerful magic cannon formerly owned by Rose Quartz. It has appeared in "Laser Light Cannon", when it was used to destroy the Red Eye, and "The Return," in which it was used in conjunction with three fused light cannons in an attempt to destroy Peridot's ship.
The cannon requires no ammunition and fires intense beams of pinkish-peach light which morph in the air, eventually taking the shape of Rose Quartz. There is no visible firing mechanism, although it appears to be activated by saying Greg's catchphrase "If every pork chop were perfect, we wouldn't have hot dogs". The beam is extremely powerful and is identified as the only thing strong enough to destroy the Red Eye. Additionally, when used with the triple light cannon, the beams appear to twirl around each other. The cannon is extremely heavy and seems to be incredibly durable.
The history of the cannon including its creation or previous use is unknown up until "Laser Light Cannon".
When Beach City is threatened by the approaching Red Eye. Garnet tells Steven that Rose's light cannon is the only thing powerful enough to destroy it, but the Gems lost track of it since Rose gave up her physical form to give birth to Steven. Steven tracks down the cannon to his dad, Greg Universe's storage unit, and after retrieving it and bringing it back to Gems, the situation becomes dire as the gravitational pull from the approaching Red Eye continues to grow, and the Gems struggle to activate the cannon until Steven remembers his Fathers often repeated aphorism: "if every pork chop were perfect, we wouldn't have hot dogs," which activates the cannon. After a brief period of set up, the cannon fires on and it destroys the Red Eye.
- The bottom of the cannon strongly resembles Steven's shield weapon.
- When Greg says his signature phrase "If every pork chop were perfect, we wouldn't have hot dogs!" in his van (while the cannon is in the back), the cannon glows slightly. This foreshadows how it was activated later.
- This also happens in the storage shed, which is how Steven was able to find the light cannon.
- Three light purple laser light cannons are shown joined together in the training cavern in the episode "Lion 2: The Movie" and "Rose's Scabbard"
- Is unknown how she created this Weapon(s).
- In "The Return" it is revealed that many laser light cannons can be activated at once by Greg's phrase.