Devil Castle Cannon (魔神城の光線砲 Majin-jō no Kōsen-hō, lit. "Light Flash Cannon of the Demon God Castle") is a beam cannon powered by the Sleeping Princess.
This weapon is seen in Dragon Ball: Sleeping Princess in Devil's Castle, and is kept in Lucifer's Devil's Castle. The cannon was created to make an energy wave powerful enough to blow up the sun, due to the fact that it is a major disturbance to Lucifer and his friends. Lucifer's mission did not succeed and the cannon had self destructed due to Goku's Kamehameha interfering with the cannon, ultimately causing Lucifer's demise due to it misfiring.