Alrighty. A lot of this will have been discussed before but... some thoughts on tactics and tech.
First a quick rundown on what
Mass Effect 1 - 2 shows us:
- Sovereign is a typical reaper (Destroyers were invented for ME3)
- The Citadel had a skeleton defense fleet which was largely overwhelmed by the Geth Heretic fleet (NB. "free" Geth weren't involved) - the Turians losing 20 cruisers to the Geth.
- Saren managed to use the citadel to shut down the relay network, which Shepard then reactivated to allow the 5th Fleet to come to the rescue. (Ref: masseffect.wikia.com/wiki/Citadel_Fleet)
- If Shepard sends in the 5th Fleet early to save the Destiny Ascension ("Save the Council"), Alliance casualties to the Geth Heretics are higher (8 cruisers), while Turian/Asari casualties are lower. (Ref: youtu.be/T2w9UAfeQ9I, youtu.be/T-o-eX7Zyw4)
- Using conventional weapons of the time, the Alliance 5th fleet battered down Sovereign's kinetic barriers, allowing the Frigate, Normandy to deliver the killing blow with a single Javelin missile. Suggesting that the Reapers toughness is due to their vast eezo power core and barriers, not an "Unobtainium" super-material hull.
- During the battle Sovereign used its beam weapon (Essentially a Dreadnought scale Thanix) to cut through alliance cruisers with minimal effort.
- Following the battle for the Citadel, the Turians recovered most of Sovereign's eezo core, and its primary weapon system. 11 months after the Battle for the Citadel (min 13 months before ME2 starts), they had successfully reverse engineered and reproduced it: The Thanix Cannon.
- The Thanix Cannon fires a stream of relativistic molten heavy-metal alloy at the target, the impact of which causes both enormous kinetic damage and radiation ("heat"), the latter bypassing kinetic barriers completely, making the weapon far more effective against heavily shielded ships (e.g. Reapers).
- Collectors are introduced as modified Protheans using Reaper technology: Better sensors, better shields, better weapons, better nanotech and so on. Their own 'beam weapon' ripped the Normandy SR1 apart effortlessly, bypassing its shields.
- The Normandy SR2, still a frigate but armed with a Thanix cannon of its own, two-shot an otherwise vastly superior cruiser (Protheans were more advanced to begin with + Reaper tech on top of that).
- The Mass Effect 2 codex states that energy projectile weapons are horrendously inefficient, to the point where the power requirements to damage ratio are considered unviable. The Collectors do use energy weapons, and samples were supplied for reverse engineering. The Thanix is essentially a hybrid kinetic/radiation weapon.
Some pretty simple conclusions that can be drawn:
- In the Mass Effect universe, materials science is limited. Adamantium / Unobtainium and other fictional 'super materials' do not exist. "Armor" is improved by simply adding more ablative/sacrificial material that weapons must destroy first.
- In every scale from the personal to the Mass Relay, objects primarilly resist damage through the use of kinetic barriers. The bigger the eezo core powering the shields, the more damage they can resist.
- As a hybrid weapon, the Thanix can cause significant damage to the hull of kinetically shielded ships. Enough localised damage could cause damage/disruption of local barrier generator (little eezo nodules), which would permit the 'matter' part to rip through. Essentially becoming the equivalent of an AP round for barriers.
- The above are true for every race, including the reapers.
Cool. What does this mean?
It means everyone using Reaper (aka Thanix) cannons are going to do a lot of damage to everyone else, because they partially bypass the effectiveness of barriers - the thing what made big ships/reapers nigh unkillable.
Even a 1-man fighter equipped with Thanix cannons (or similar hybrid matter/energy weapons) can inflict damage upon a reaper while its barriers are active. A small amount to be sure, but they can be nickle-and-dimed to death. Of course, the same is true for the Occuli and Alliance cruisers/dreadnoughts, requiring GUARDIAN lasers (which devour power to inflict moderate damage - good only for shooting down missiles and enemy fighters) and their own fighter interceptors.
Some thoughts on tactics using the above:
The ideal weapon against the reapers is not the Dreadnought. The reapers simply 'do better dreadnoughts' than we do, though
in combat they are less maneuverable as their incredible speed and maneuverability comes exclusively from their enormous Mass Effect Core and using it to dramatically reduce their mass to overcome inertia - something that would be certain death to try while under fire (according to the Codex, anyway). Probably because it would require them to drop their barriers or some such (refer above).
Additionally: A dreadnought has a crew of thousands, a cruiser of hundreds and a frigate of dozens and a fighter has a crew of 1. A dreadnought takes a half-dozen reaper hits, a cruiser 1-2 and a frigate just one.
Reapers can't shoot backwards. This is bad for them. It also means the best means of combating the reapers is
not to try and build big - but to build
lots. Focus on numbers and flanking: Frigate wolf-packs and for larger fleets, carriers (who keep their distance as much as possible - also useful as bait) launching fighter swarms comprising of thanix-using 'bombers' and anti-occuli interceptors.
But the Codex says...This comes up a lot so I'll address it: "The codex says you need 4 dreadnoughts to take down a reaper's shields"
With mass accelerator weapons aka slugthrowers, this is true. Let us use an analogy. Tanks.
Back in the days of warfare being infantry with firearms, the introduction of tanks was to bring in indestructable engines of death - when you saw one, you ran or hid, because with your rifle there was not much you could do to its armoured hull. Sure, enough people focusing fire on it might get lucky, but for the most people it could just roll over entire infantry platoons with ease.
This battlefield supremecy lasted a while, but not forever. People are ingenious when they need to be. "Bazookas" personal one-shot armor-piercing explosive missiles, anti-tank mines, molatov cocktails (for the truly suicidal): Weapons to bypass the incredible armor of the tank to allow it to be destroyed by a single soldier. Weapons that were developed in response to the
need for them.Mass Accelerators are the rifles of the pre-ME1 universe - cost effective and fit for the task of shooting each other, but woefully ineffective against a reaper with active barriers. And unlike in past cycles, not only did we not suffer galactic lockdown and surprise invasion (with most of the galaxy having no clue what was happening), but we got to kill a reaper and examine the remains to see what made it tick.
And from that came our anti-tank weapon: The Thanix.