Mega Weapon

The Mega Weapon was created by Lord Garmadon by unlocking the Golden Weapons' full potential at the Golden Peaks. Lord Garmadon levitated the weapons into a sphere of blazing gold fire. They then fused together, creating the most powerful device in history: the Mega Weapon. It floated to Lord Garmadon, who grabbed it, only to scream in pain. The weapon's gold light briefly flowed through his hand, but then Garmadon gained control of the Mega Weapon and vowed to defeat the ninja. His resulting evil laugh carried throughout the entire world of Ninjago.

History
The Golden Weapons were hid all over Ninjago (World) until the Ninja found them. Then at the season finale of the rise of the snakes the Ninja give Lord Garmadon their weapons to destroy The Great Devourer. Lord Garmadon then runs away with them. In Darkness Shall Rise he uses their power of rebuild the the bounty into The Black Bounty. Once reaching the Golden Peaks he combines all of the weapons into one. Later at the Black Bounty, the serpentine wondered what it does, but Lord Garmadon didn't seem to know. Right then, they saw the Ultra Dragon flying by. They chased the dragon while Garmadon tried to kill it, but it didn't work. Lord Garmadon blamed the serpentine for not being a good crew. He threw a fit in the captain's quarters and swang the Mega Weapon all around and then Captain Soto's log popped out of the desk. Garmadon read it and thought that Soto's crew knew how to fly a ship. He wished they were there and then black smoke swirled around the weapon and the book the weapon started to glow and shake. Lord Garmadon heard Captain Soto's voice saying who he was. Back on deck, the pirates and the snakes were arguing about who owned the ship. While they were arguing, Lord Garmadon found out that the weapon doesn't destroy, but that it only creates.