History GameBreaker / MassEffect

* In multiplayer, you can acquire an item called the Targeting VI, which will augment headshot damage by 25%, 50%, or 100%, depending on the level. If you can consistently get headshots, you can use this in conjunction with a semi-automatic sniper rifle - say, the Raptor or the Indra. Watch yourself score at the top of matches every time.

* This game's version of Stasis has the most potential for game breaking yet. Unlike the first two games, enemies under the effects of Stasis ''can'' take damage (though too much damage will break the stasis effect). It also acts as a source power for biotic explosions (which means you can follow up with Warp or Throw for massive damage), and a Rank 6 evolution lets it create a bubble that will stun any unarmored enemy that walks into it, making short work of even dreaded enemies like [[DemonicSpiders Phantoms]].

* Take [[WrenchWench Tali]]. Max out Quarian Machinist, Electronics, and her gun skills. Give her the quarian armor from 'Bring Down the Sky and the best shotgun you find. In terms of survivability, she'll outclass ''[[TheBigGuy Wrex]]''.

* Take [[WrenchWench Tali]]. Max out Quarian Machinist, Electronics, and her gun skills. Give her shield-boosting armor mods and the best shotgun you find. In terms of survivability, she'll outclass ''[[TheBigGuy Wrex]]''.

* Now that Overload works against both regular shields and biotic barriers, it's surpassed Warp as the go-to anti-defense power. In addition, it's later evolutions can make it jump from target to target chain-lightning style, as well as impart a neural shock effect, and you've got quite the game breaker.

* Vanguards have become field-wipers in this game thanks to their new ability, Nova. Nova is normally a DeathOrGloryAttack because it drains your shields to cause a huge biotic explosion. However, the vanguard staple Biotic Charge ''regenerates'' shields whenever it's used correctly. Should a vanguard equip nothing but a light pistol or SMG, the cooldown between the two would be short enough that a fast player could jump around blasting any enemy in range over and over again until all that's left is a pasty smear on the wall.
** However, YMMV, as [[DifficultButAwesome a single mistake from the vanguard will get them killed]] (and likely amongst the enemies, where their allies can't reach them), as well as objectives requiring one to stay in one area will block him or her from being useful.
* The Particle Rifle is ridiculously strong and useful due to its lack of needing ammo, to the point where taking no other weapons at all is a perfectly viable strategy even for weapon-focused classes.
* The N7 Crusader Shotgun (Collector's Edition only). It fires a single, accurate, solid slug rather than shot. This essentially makes it an unscoped sniper rifle, with comparable stopping power to the single shot sniper rifles...except it's semi-auto.
* The N7 Eagle. It's got the accuracy and power of a pistol, and the fire rate of a SMG. Put a scope on it, and you have a full auto SniperPistol. Like the Particle Rifle, you can probably take nothing but the Eagle and do just fine.

* Adrenaline Rush. Unlike the later games, each power in [=ME1=] had its own cooldown, independent of all the others. What Adrenaline Rush does is instantly reset the cooldowns of all your powers so you can use them again instantly. In the hands of a Vanguard, this essentially amounts to dual-casting Lift, Throw, and Barrier, with a side of Marksman/Carnage for good measure. And by the time all those run out, you'll probably be ready for another Adrenaline Rush. Oh, and since you've got a bio-amp anyway, Vanguards are ideal for using a biotic bonus power like Singularity for even more chaos. And in case you're worried that tech powers were left out of the fun, Garrus also packs Adrenaline Rush for all your rapid-fire-Overload/Sabotage needs. Enjoy.

* The Particle Rifle is ridiculously strong and useful due to its lack of needing ammo, to the point where taking no other weapons at all is a perfectly viable strategy even for weapon-focused classes.

* Take [[WrenchWench Tali]]. Max out Quarian Machinist, Electronics, and her gun skills. Give her shield-boosting armor mods and the best shotgun you find. She'll be able to take more damage than [[TheBigGuy Wrex]], kill everything with her shotgun, and her tech skills will be excellent as well.

* If one has the right combination of weapons and upgrades, the Infiltrator class becomes unstoppable. You can literally pick a room clean before you enter, once you get Assassination + Commando maxed out.

* If your class uses Omni-tools or Bio-amps, you want a Savant-brand Omni-tool/Bio-amp from Serrice Council. There isn't a single other OT/BA that provides bigger boosts in ''any'' category.
* [[InfinityPlusOneSword The Spectre Master weapons]], gained by amassing a million credits and buying them from the C-Sec/Normandy requisitions officer. Every other gun pales in comparison.

* The Collector Beam is more than capable of stripping the bigger baddies of their health, armour, shields and biotic barriers extremely quickly. Heck, if you take it on Grunt's Loyalty Quest, consider that kill the Thresher Maw achivement yours. The only downside is it's rapid ammunition consumption - but you find plenty of Heavy Weapon ammo around, and with the ammo upgrades, it's probably the best Heavy Weapon out there.

* The humble Pull. If your character is a biotic of ANY kind, this skill recharges obscenely fast. It will leave any enemy it touches open to your next entire magazine of ammo. And it homes in on it's target. The only (small) problem with this is... well, you can't use it when the enemy has shields, armour, or barriers up, but considering that you already have powers to take those down as well...
* As a Sentinel or Adept, Warp ''will'' be your go-to power on anything harder than Normal. It's effective against 3 out of 4 damage types and can detonate other biotic powers for even more MassiveDamage. The aforementioned Pull is in fact one of the better powers to combo it with. And like all biotic powers, if Shepard has it you can make it arc around cover, allowing you to play as a biotic artillery unit able to tear apart enemies that a more gun-focused class could only play peek-a-boo with.
* Like the aforementioned M-29, Kasumi's M-12 Locust can also be obtained incredibly early in the game, and has the highest base damage and damage multiplier of all SMG's in-game, making it ridiculously good for most enemy encounters. In terms of damage-per-second, the M-12 also beats the most midgame weapon pickups, and doesn't require Assault Rifle training for Engineers, Adepts or Sentinels. The only downside is a slightly lower clip capacity.
* Halfway through the game, you have the opportunity to wield either Assault Rifles, Shotguns or Sniper Rifles if your class lacks the ability to wield them. That's not the GameBreaker. If your class ''already'' has the ability to wield said weapon, you get the [[InfinityPlusOneSword Infinity Plus One version]] instead. ''They'' are the {{Game Breaker}}s.
** The Revenant light machine gun, with its [[MoreDakka high rate of fire]] and [[ForMassiveDamage extremely high damage output]]...[[ImperialStormtrooperMarksmanshipAcademy if you can hit anything with it]]. It becomes a ''much'' more effective weapon once you research the accuracy upgrade. Couple it with [[BulletTime Adrenaline Rush]] and you've basically got a heavy weapon with massive thermal capacity.
** The M-300 Claymore shotgun, a [[OurWeaponsWillBeBoxyInTheFuture brick-shaped]] ShortRangeShotgun that can normally only be wielded by a freakin' KROGAN. Shoot something with it at point-blank range, and [[OneHitKill it isn't getting up]]. Combine with the Vanguard's [[FoeTossingCharge Biotic Charge]] to make that task a ''lot'' easier.
** The M-98 Widow, a sniper rifle normally used against ''tanks''. [[ThereIsNoKillLikeOverkill You spend most of the game fighting infantry]]. [[BoomHeadshot Get a headshot with this rifle]] and [[OneHitKill you can kiss your target goodbye]].
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* The M5 Phalanx pistol is RIDICULOUSLY powerful, to the point where the player can use up a whole magazine during Adrenaline Rush and get one-shot kills on an entire cluster of enemies.

* The M5 Phalanx pistol is RIDICULOUSLY powerful, to the point where this troper can use up a whole magazine during Adrenaline Rush and get one-shot kills on an entire cluster of enemies. It's useful enough that this troper keeps it equipped 80% of the time, even on the final level.

* The Revenant light machine gun, one of the pick-up options for Soldiers while in the Collector ship, becomes a ''much'' more effective weapon once you research the accuracy upgrade. Couple it with Adrenalin Rush and you've basically got a heavy weapon with massive thermal capacity.

* The Revenant light machine gun, one of the pick-up options for Soldiers while in the Collector ship, becomes a ''much'' more effective weapon once you research the accuracy upgrade.