Requiem Blaster (Megatronus)

The Requiem Blaster is a powerful weapon of the Thirteen that is able to draw power from a quasar's sound waves, a supernova's thermal energy, or a black hole's gravity. The blaster is massive enough to have its own gravity and is far too large for a modern transformer to wield or even pull the trigger.

The former archivist Optimus Prime has never encountered any record of a Transformer surviving a direct hit from the Requiem Blaster. It might just be the most powerful weapon ever.

Aligned novels
The Requiem Blaster is said to have been reluctantly created by weaponsmith Solus Prime, at Megatronus's urging to protect Cybertron against Unicron. Possessed of great power, the Blaster is allegedly capable of leveling mountains. According to legend, the Thirteen decided by a vote of seven to six to allow the weapon to exist. Stories say the Requiem Blaster was placed on a ship which was lost in deep space.