Naljian Destructor

The Naljian Destructor is a Level 20+ tech (making it even more advanced than the Omnitrix itself, which was only at level 20) that can turn into a robotic version of what ever it sees. It can even form into one giant thing of everything it has seen. It will do whatever it sees something do.

It appears in the episode Busy Box where it causes havoc every where. When Ben Tennyson went near it, it transformed into a duplicate of Ben. It even transformed into Humongousaur when Ben transformed into it. The Naljian Destructor even turned into Spidermonkey when Ben turned into Spidermonkey. When Kevin Levin went near it, it turned into Kevin and even into Kevin's rock/metal form after Kevin's ID Mask was broken. When Gwen Tennyson went near it to reason with it, it also turned into Gwen and tried to meditate. Around that time, the Vreedle Brothers arrived identifying the technology and tried to claim it. As Ben turned into Swampfire, the Naljian Destructor also turned into Swampfire. It even managed to turn into each of the Vreedle Brothers as they baited it to their side and made off with it. Moments later, the Vreedle Brothersreturned stating that it has become too powerful for them to control and leaves them on Earth. The Naljian Destructor then transforms into an amalgamated version of Humongousaur, Spidermonkey, Swampfire, the Vreedle's weapons, and Kevin which then went on the attack. During the fight, Ben, Gwen, and Kevin managed to find it's weakness in it's core.

After Ben as Lodestar manages to have it's core removed, the thing fell apart. It was just a play toy of a Cosmic Being's child. She then explained that it was a dangerous weapon to them because their species was too young to properly use the Naljian Destructor for its intended purpose. The mother of the child reassembled the Naljian Destructor and left after stating it was clearly marked "not for children under three million years old" (a play on the line: "Not for children under three years old" marked on modern children's toys).

It is likely that Naljian Destructor is a name that was given to it by other species, not the Cosmic Beings' real name for it, as its true purpose is a children's toy, not a weapon, so thus the 'Destructor' in its title wouldn't make sense.