Are they nuclear? Because the radiation from that can kill/mutate the next cycle of evolution, so they wouldn't want that.

Is there any intel on how their weapons work? Is it simply thermal destruction with laser power?

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    I'm voting to close this because a) this question has no impact on gameplay and b) it falls into ask-the-dev territory, which has been agreed on to generally be off-topic. This question is also more likely to elicit more discussion than desired.
    – MBraedley
    Oct 4, 2012 at 11:03
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    @MBraedley I disagree. This is a "how does it work?" question, not a "why does it work that way?" question.
    – Sterno
    Oct 4, 2012 at 13:48
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    Seems to me lore questions are allowed as long as the question is answerable, which this one certainly seems to be. meta.gaming.stackexchange.com/questions/1548/…
    – PeterL
    Oct 4, 2012 at 14:43
  • Lore questions in general are something the community is divided about. They cause controversy, regardless of it's on topicness or not.
    – Frank
    Oct 4, 2012 at 15:39
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    It might be a closer fit for scifi.stackexchange.com than gaming, but it's a perfectly valid question. Oct 5, 2012 at 6:56

2 Answers 2


This actually depends on what kind of Reaper you're talking about, as they're classified into four known types. I'm assuming you're actually asking about Sovereign class dreadnought ships, also known as Reaper Capital Ships, rather than Destroyers, as those are a smaller subtype. Sovereign's primary weapon in particular is described here on wiki page:

Sovereign’s destructive power was unrivaled in the known galaxy. Each of the "tentacles" extending from its bow was equipped with a powerful "magnetohydrodynamic" weapon which ejects a stream of molten metal at a fraction of the speed of light which could tear through a cruiser in a single sustained burst. Its gigantic spinal-mounted gun was able to rip through the hulls of even the largest of dreadnought-class ships with ease, effortlessly penetrating their kinetic shields.

If you want official citations from the game itself, this information is detailed more in the ingame Codex entry from Mass Effect 2 in the Thanix upgrade to the Normandy SR-2, a section of which I have quoted here:

Contrary to popular belief, Sovereign's main gun was not a directed energy weapon. Rather, its massive element zero core powered an electromagnetic field suspending a liquid iron-uranium-tungsten alloy that shaped into armor-piercing projectiles when fired. The jet of molten metal, accelerated to a fraction of the speed of light, destroys targets by impact force and irresistible heat.

More information can be found under the Reaper Capabilities Codex entry:

The main gun on a Reaper capital ship dwarfs that of the Alliance's Everest-class dreadnoughts. No dreadnought has yet survived a direct hit from the weapon. Estimates put its destructive power anywhere from 132 to 454 kilotons of TNT. Even if the target is hardened, as in the case of a surface-based missile silo, the gun can instead bury the target beneath molten metal. Precise targeting computers and correctors also give the Reaper weapons a longer effective range than organics' dreadnoughts or cruisers.

In regards to the other subtypes, Destroyers are smaller than the Capital Ships and possess less firepower than Capital Ships, but some of them possess a Hades cannon, which is described as a "massive directed energy cannon" used as an anti-aircraft weapon. These were seen in ME3 during, mostly during Earth's occupation.

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    There's also some information on the various ground troops, such as Harvesters and Ravagers, but I assumed you were only asking about the larger ships. If you'd like that information as well, I can edit it in.
    – FAE
    Oct 4, 2012 at 14:20
  • @desaivv - Nice catch, I missed that. Magnetoferrodynamic, maybe?
    – SaintWacko
    Oct 4, 2012 at 15:36
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    @desaiw Hydro actually means fluid in this context. Magnetohydrodynamic pertains to magnetic and electrically conductive fluids.
    – CaulynDarr
    Oct 4, 2012 at 15:48
  • I was actually interested only in Destroyers - but I appreciate the extra info =) thanks!
    – Aditya M P
    Oct 5, 2012 at 2:49

It's a high energy particle weapon. Given that the Thanix Cannon is reverse engineered from Sovereign's guns, and the destroyers would probably be using the same tech. It would work as such:

The Thanix's core is a liquid alloy of iron, uranium, and tungsten suspended in an electromagnetic field powered by element zero. The molten metal, accelerated to a significant fraction of the speed of light, solidifies into a projectile as it is fired, hitting targets with enough force to pierce any known shield or armor. The gun can fire reliably every five seconds. The weapon's relatively small size allows it to be mounted on most fighters or frigates, including the Normandy SR-2, and gives them firepower rivaling cruisers.

From the wiki

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    No, George Lucas lies to you. If you see a beam of light shooting though a vacuume it can't possibly be a laser. Lasers are only visible where they reflect off a surface. If it was a beam it would have to be composed of some type of particle that was emitting it's own energy.
    – CaulynDarr
    Oct 4, 2012 at 15:49
  • Upvoted, thanks! But accepting the other one because of the extra info I could geek out on... good day!
    – Aditya M P
    Oct 5, 2012 at 2:50

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