This is Grunt's loyalty mission, in which he requests that Shepard travel to Tuchanka so that he may complete the krogan rite of passage.
In the cargo hold of the Normandy SR-2, Grunt will pace back and forth restlessly as he tells Shepard that he is unnerved by his intense desire to destroy and kill. It has become an involuntary compulsion rather than an intentional, pleasure-seeking activity. He requests that Shepard take him to Tuchanka, as EDI is lacking in the area of medical records pertaining to krogan, who now fiercely guard their medical data since the salarians used it against them with the genophage.
All of the enemies in this mission are armored, and most of them aggressively attempt to close to point-blank range. Therefore Mordin, with his Incinerate for frying armor and stopping krogan regeneration and his Cryo Blast for freezing things that are charging you, makes an excellent companion for this mission. If Garrus is loyal (and thus has Armor Piercing Ammo available), then he's another good choice, though if Grunt or Shepard has the Squad Incendiary Ammo evolution then Garrus is more superfluous.
Also... if you're in the mood to actually kill the Thresher Maw, consider bringing a long-range heavy weapon - either the Cain, the Arc Projector, or the Missile Launcher, though to be clear it is entirely possible to kill the Thresher Maw on Insanity using only a Heavy Pistol and your squadmates' powers.
With Grunt in your party, speak with the current leader of Clan Urdnot, who is either Shepard's old friend, Wrex, or (if he died on Virmire or was never recruited) his brother, Wreav. Either will note that Grunt is not sick, he is of the age where he must complete the krogan rite of passage, and refers the party to the clan Shaman. The clan Shaman will relate various information about the rite, as well as krogan history and culture. Gatatog Uvenk will protest Grunt taking the rite, as he is tank bred. You can get Uvenk to stand down in a number of ways. After Shepard agrees to be Grunt's krantt, the Shaman sends Grunt and company to the traditional grounds of the rite.
"Let's Get Started, Shepard, Hit the Keystone" Edit
To begin each of the three waves of the Rite, you will need to activate the "keystone" that's near the central stairs where Shepard is standing when you enter the area.
Before beginning the first wave, take a moment to run bypasses on the turbine parts on either side of the central stairs and salvage the credits from four dead krogan on the upper level. There are also three Med-Kits and two power cells.
Insanity Tip: It is best to leave the power cells and medkits where they are until you need them. However one power cell box and one medkit are on the lower level - you may wish to collect them before the third wave starts. Finally, as soon as you beat the Thresher Maw in the third wave you will no longer be able to loot any of the objects, so be sure to get them all picked up before that happens.
Remember to get all of your ammo powers equipped - preferably Incendiary, Warp or best of all Armor Piercing. Also before hitting the keystone, you can take this time to scout out the area and note the locations of ammo cartridges, all of which will respawn repeatedly throughout the rite. Grunt will "helpfully" remind you to hit the keystone precisely every fifteen seconds when you are between waves, just to keep you from getting too distracted.
Wave One EditVarren - The first wave summons multitudes of varren and they all descend upon Shepard, Grunt and the third party member. Since they can only attack at melee distance, they should all be dispatched at range. They come from two sides of the map at the opposite corners from the switch, so you need to stay sharp and not leave your back unguarded.
Insanity Tip: Get the armor stripped off each varren as quickly as possible, so that you can then use powers to slow down their approach.
Note: It is possible to face the varren all from one side if Shepard quickly makes it to the top of the center set of stairs (it's really a bit to the right of center). The varren will all come up at Shepard up from the bottom of these stairs as it is the quickest route to Shepard and the team.
Once all the enemies are down, Grunt will begin reminding you to hit the keystone. Before you do that, walk around and refill all your ammo.
Note: There is a glitch wherein when you kill all the varren there will still be one left, this varren does not have a health bar it just has a name saying varren, it will not attack and it will not die, whenever you try to kill it, it will just stand up and stay in an aggressive stance. There are two solutions for this; either reload the game, or have a biotic squadmate use Pull, and repeatedly shoot the varren with your shotgun in an upwards direction, effectively blasting it out of the map. If successful, the Rite will continue.
Wave Two EditKlixen - These fire-breathing creatures make up the second wave and are delivered by harvesters on either side of the map; don't waste your ammo, the Harvesters cannot be killed. The klixen will need to be taken out while you are still out of their fire-breathing range or they can quickly cause havoc and deal a lot of damage. They are resistant to Incendiary Ammo and Incinerate (but their armor isn't) and they're weak against Armor-Piercing Ammo, Reave and Warp Ammo.
Insanity Tip: Once you've stripped their armor, abilities like Grunt's Concussive Shot can stop the klixen before they get too close.
Tip: If you watch your teammates carefully, they will automatically face the direction of the next incoming harvester.
Once the klixen stop coming, Grunt will again start reminding you to hit the keystone. Refill your ammo before you do so, and consider collecting the medkit and powercells that are down on the lower level before you begin wave three -- they are difficult to collect while being attacked by a Thresher Maw.
Note: Just like with the varren in wave one, there is a glitch where there will still be one klixen left without a health bar, and it just has a name saying klixen. Sometimes it will not even be visible, but will appear to be hidden under the ground. Just as before, there are two solutions for this: Either reload the game, or have a squadmate use Pull, and repeatedly shoot the klixen with your shotgun in an upwards direction, effectively blasting it out of the map. If successful, the Rite will continue.
Wave Three Edit
Thresher Maw - This is not so much a wave as it is a giant creature attack. There is only one Thresher Maw and the primary objective is simply to survive. All you have to do is survive the attack for five minutes and the test will be ended, though there are additional dialogue accolades if you succeed in taking it down.Arc Projector is very effective on the Thresher Maw, especially with spare power cells lying around - as long as you haven't wasted it on the first two waves.
- When the Thresher Maw is on the left or right side of the battlefield, interpose the central steps (near the keystone) between you and it. That way you can pop out and shoot in between acid spittles. You can also interpose the various "square columns" thereby saving "sprinting" time, but many of those are destructible and will only block a single shot from the Maw - always have an exit plan.
- When the Thresher Maw moves to the center, keep an eye out for the two taller pylons at the far end of the upper platform -- not only is the Thresher Maw unable to destroy them, but if you interpose them perfectly between Shepard and the Thresher Maw they will block the Thresher Maw's acid spittle but leave plenty of places visible to shoot at.
- Shepard's shields take longer than usual to recover after an acid hit, so be careful. On the plus side it takes about three consecutive hits to kill Shepard even on Insanity.
- If you are playing this part on Insanity, even a Heavy Weapon such as the Collector Particle Beam won't be much good against the Thresher Maw's armor. The best strategy is to utilize Armor-Piercing Ammo on the creature (Warp and Incendiary Ammo being reasonable second choices), and have your squadmates constantly help you in attacking the Thresher Maw.
- Grunt's Concussive Shot, even though marked as ineffective against armor, if applied when the Maw surfaces will "stagger" the Maw reducing the number of acid shots it will take before retreating.
- Zaeed's Inferno Grenade, Mordin's Incinerate, and Samara's Reave are examples of good squadmate attacks to use. Armor Piercing Ammo is also a good idea, and having weapons with high armor penetration (such as the Widow, Revenant or Mattock) will go a long way to damaging the Thresher Maw.
- The Cain is also a good weapon to use, but will usually only damage half the Thresher Maw's health. The Thresher Maw is immune to the effects of Stasis.
- Even on Insanity, a Heavy Pistol is more than sufficient to kill the Maw provided you are able to use it constantly and efficiently. You'll need to minimize the time you spend running between hiding places while finding enough ammo and nonetheless avoiding getting staggered by acid blasts - it's fun!
Uvenk's Folly Edit
No matter what conversation option Shepard chooses, they end up engaging Uvenk and his krantt. Uvenk has a barrier and armor that need to be taken down to kill him and there are three or four Gatatog Warriors with him. Once they are all dead, you will automatically return to the Urdnot camp and speak to the Shaman. The Shaman will welcome Grunt as a full-fledged member of Clan Urdnot and award you a shotgun damage upgrade. Once you're done speaking with the Shaman, the mission will end.
Insanity Tip: For whatever reason most of the krogan, including Gatatog, will move rapidly away at the beginning of the combat, so you will really only be dealing with one or two krogan attacking at any given time - concentrate on one attacker and obliterate it before it can get behind your cover. Once only Gatatog and perhaps another krogan are left, you can easily dash about the area to improve your position, loot corpses, etc.
Note: If you brought the Arc Projector and still have ammo, you can wreak havoc on the krogan by targeting Uvenk at the start and shocking them to death. If one of them gets past the shock radius, just have Grunt and your other ally target them to take the heat off you.
Note: There are two krogan corpses that can be searched and two Medi-gel packs to be picked up during the fight against Uvenk. But you have to loot them before finishing the fight because you will automatically leave the area. One is located down the stairs by the medi-gel packs and the other is behind the last barricade where Gatatog and his troops are positioned.
Mass Effect 3 Consequences Edit
Grunt appears during Attican Traverse: Krogan Team provided he survived the suicide mission. At the end of that mission, if you choose to spare the Rachni Queen, Grunt will die if this mission was not completed.
After the mission is complete, Shaman Urdnot sends Shepard this email with what one might call a "request":
Mission Summary Edit
Grunt has joined Clan Urdnot and should be emotionally stable.
Will monitor krogan’s progress of societal acceptance with Clan Urdnot. Hopefully clan bonds will not interfere with loyalty to Shepard. Data regarding krogan clan politics useful.
- Experience: 750 (937)
- Credits: 30,000
- Cerberus Funding: 15,000
- Credits Found: 15,000
- Power Unlocked
- Grunt: Fortification
- Platinum: 2,000
- After this mission, if Shepard killed the Thresher Maw, several krogan will comment on the Thresher Maw Shepard killed, stating that it has not been done since Urdnot Wrex underwent the Rite himself.
- Upon returning to Tuchanka after the quest, should Shepard have killed the Thresher Maw, EDI will report that there have been numerous breeding requests directed for Grunt. Humorously (and to Grunt's amusement), there is also one for Shepard.
- During the fight with Uvenk, heading up the flight of stairs and examining the giant piston will reveal the words: "Lots of very small text put something interesting here or whatever" upside-down.