The most common superweapons, Mega-Cannons are powerful weapon capable of destroying fleets, planets and stars, by Dark Chronoscopic.
The weapon was originally created by the New Kralgon Empire to destroy the United Nations of Ottzello during the Third Ottzello Galactic War. The Mega-Cannon was put to good use destroying the Hostile Xenoform Threat, and was then passed into UNO's group.
Mega-Cannons are normally attached to the bottom of Kralgon Obliterators, they are a long cannon attached by multiple wires.
They are normally used as a deterrent; no empire wants to be against these weapons. Being a superweapon, they require a large amount of energy, and so take time to charge up. They can also be used at the start of wars, to show the enemy that UNO are powerful and not to be messed with. It requires Ioketa to keep the ship stable with this much energy charged up in one location.
Being a Hyperspace weapon, or subspace weapon, it uses hypermatter radiation to affect hyperspace itself, often making warp or hyperspace travel difficult or even impossible. As one of the most powerful ones, sometimes known by names such as "mass shadow generators", it can destroy any high-mass objects such as planets, stars, and even black holes. The effect is more destructive than that of a hyperlaser, but can also have the added impact of a permanent disruption to local spacetime.
Using Chronoscopic, the target can be restored to a point before UNO's target enemy took over, but this requires a lot of Ioketa's energy. This means that UNO can destroy a star system and take it themselves.
Evading this weapon is nearly impossible. Short of getting out of range of the projectile before it detonates and releases the radiation, there's not much you can do, unless you try to damage the ship's reactors to prevent it from firing.
The weapon is incredibly powerful, and is useful to destroy weak points in the enemy, as well as strategic locations that wouldn't be useful to UNO. It's not wise to use this weapon consistenly, as it drains energy. If UNO wish, they can destroy the world and rebuild it.