The Reaper's main weapon is often referred to as a laser (because it looks like one)
But it is actually a cannon mounted from the top of the spine right down to the "head" from where the actual beam is fired. Instead of firing kinetic projectiles like most species do, it instead fires a steady stream of molten metal at a fraction of the speed of light.
The resulting beam works on the same principles as an "water jet cutter":

It cuts through the material it hits by its insane pressure. Armor of the organic species in the Mass Effect series is designed to withstand single shots of projectiles and not a steady stream of impossibly pressurized molten metal.
The reaper's powerful mass effect fields can also swing the beam around and use that to cut the target ship apart or hit multiple targets at once.
The actual beam is most likely only a few centimeters thick and keeps its destructive pressure over long range with "reaper magic"
Reaper destroyers use the same weapon, although it has a LOT less destructive power compared to the beam of a Sovereign-class reaper since their "barrel" is significantly shorter.
Sovereign-class reapers only have one such "main cannon", but Harbinger has a second one with increased firepower since he is one kilometer larger than a sovereign-class reaper. Harbinger uses both of them to kill anyone who tries to get to the "citadel beam"






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