Ultimate Weapon

The Ultimate Weapon is a large real world laser-pointer that appears in The LEGO Ninjago Movie. It is what ultimately summoned Meowthra to Ninjago City.

History
At some point, Master Wu came to acquire the weapon, storing it on the Destiny's Bounty.

The LEGO Ninjago Movie
While discussing with Lloyd on how weapons alone will not solve his problems, Master Wu reveals he has all kinds of weapons, one of them being the Ultimate Weapon. Lloyd asks Wu why he hasn't used it, with the elder master telling him that in the wrong hands, it could bring doom to all of Ninjago. Lloyd suggests he uses it, but Wu tells him that currently Lloyd's hands are the wrong hands.

The next day, when Garmadon arrives with his Garma Mecha Man, Lloyd attempts to use his Green Ninja Mech Dragon to destroy Garmadon's mech, but to no avail. Garmadon then uses his mech to throw Lloyd and his mech towards the docks, where it lands near the Destiny's Bounty. Lloyd then gets an idea and sneaks aboard the ship and steals the Ultimate Weapon while Wu is fighting some of the Shark Army that has boarded the ship.

After acquiring the Ultimate Weapon, Lloyd uses his mech to fly to Garmadon and his mech, who has now climbed to the top of the largest building in the city. Lloyd pulls out the Ultimate Weapon, ordering Garmadon to stand down, much to Garmadon's surprise. Lloyd then has Garmadon dispose of all of his ammunition for his mech. After doing so, he notices how nervous Lloyd is and begins slowly walking towards him with his mech. Lloyd then threatens him again with the Ultimate Weapon and, after a brief moment, fires it at Garmadon's mech, releasing a red beam of light, much to the surprise of Lloyd and Garmadon. While trying to turn it off, he aims the weapon down to the city below, causing a loud noise to begin to approach the city, with Garmadon asking Lloyd what he has done.

Meowthra then appears, but at first the citizens of Ninjago awe over the cat, but their expressions turn to fear when Meowthra then destroys a nearby building, causing a mass panic. As Lloyd desperately tries to turn off the Ultimate Weapon, Garmadon orders his general to subdue him. While Lloyd is distracted in trying to fend off the generals, Garmadon snags the Ultimate Weapon from Lloyd as his general tackle him down. Triumphant with the Ultimate Weapon, Garmadon thanks Lloyd for "warming it up" for him before using it to order Meowthra to take down all of the Ninja's mechs, must to Lloyd's sorrow. Garmadon then has his mech kick down Lloyd's dragon mech off the building, destroying it. As Garmadon celebrates his victory, Lloyd, in a fit of rage, reveals his identity to his father, much to his surprise. As Lloyd tells his father that he ruined his life, Garmadon tells him that he couldn't have ruined it considering it wasn't there. Enraged, Lloyd pushes aside his two captors before kicking the Ultimate Weapon out of Garmadon's hands, causing it to fly up and fall off the side of the building, causing it to smash into the ground below, destroying it.