The most powerful technology of DC Comics can save worlds or destroy them. Metahumans, good or bad in the DC Universe, derive their powers and abilities from high-tech devices. Sometimes, it's the same person using a device for good and then later changing their minds. Technology from DC Comics can rival the power of the gods, meaning the tech can just as easily create life as it can destroy it.
Sometimes, Batman creates a satellite meant to monitor heroes that is later used by villains to take out those same heroes. Other times, there are devices like the Motherbox, which are used for benevolent reasons by the gods of New Genesis and destructive reasons by their brother gods on Apokolips. To quote a different company, "With great power comes great responsibility." There's no greater power than the technology featured in the DC Universe, which indicates there must be great weapons floating around, too.
The Mobius Chair
What Is It? The Mobius Chair is a transportation device capable of traveling through space and time.
Who Made It? The Anti-Life Monitor, AKA Mobius, created the Mobius Chair to discover the secrets of the universe. However, the chair is typically used by Metron, a New God who is obsessed with knowledge.
How Could It Break The Universe? The Mobius Chair can travel through space and time, and that's not even its most powerful ability. The chair grants its user nigh-omniscience, meaning anyone who sits on the Mobius Chair basically knows everything. One can only imagine if a villain like the Joker were to sit on the chair.Powerful technology?
What Is It? Amazo is a robot that can replicate any power it sees.
Who Made It? Professor Anthony Ivo was a mad scientist who worked for Star Labs. Ivo was something of a loose cannon and often spent time working on his personal projects. One of those projects was the robot known as Amazo.
How Could It Break The Universe? After encountering the Justice League, Amazo became a robot controlled by a mad scientist that possessed all the powers of the world's greatest heroes. Sure, the Justice League has always been able to stop him in the past, but they should consider themselves lucky. Amazo has the powers of Superman, which means he has the power to destroy the world whenever he pleases. (Luckily, he was disassembled in his last engagement with the League)
Luthor managed to take the basic idea of Amazo and turn it into a virus that took powers away from metahumans and brainwashed them. Later, Luthor managed to create an Amazo Armor that gave its wearer the powers of Amazo.Powerful technology?
The Cosmic Treadmill
What Is It? The Cosmic Treadmill is a treadmill that allows super-speedsters to travel through time while running on it.
Who Made It? Barry Allen's stories have long involved time travel. Soon after his first experience accidentally traveling to the past, Allen decided to create a device that would allow him to accurately and safely traverse time. This led to the invention of the Cosmic Treadmill.
How Could It Break The Universe? Time travel is inherently dangerous, and Barry's own meddling with the time stream has led to the creation of villains like Reverse-Flash and Zoom. A villain with access to time travel could undo all human progress if they so desired.Powerful technology?
The Miracle Machine
What Is It? The Miracle Machine is a device capable of turning thought into reality.
Who Made It? The origin of the Miracle Machine is unknown, although it seems to have some connection to Metron. The Miracle Machine first appeared in the comics when it was given as a gift to the Legion of Superheroes. However, the Legion ultimately decided it was too powerful and dangerous to be used.
How Could It Break The Universe? The Miracle Machine can turn thoughts into reality. If someone thinks about their own demise, they perish. If they think about the demise of someone else, that person is a goner. In one of its first appearances in the comics, Brainiac 5 used it to construct a new base for the Legion of Superheroes. After using it, one of the Controllers showed up to warn of the possible catastrophes that could be caused by it.Powerful technology?