In this game our main mission is to unite humanity and aliens of the galaxy in order to stop the reapers( godlike machines that come every 50000 years and wipe out all intelligent civilizations.)
In last part we found a Rachni(insect-like species)) Queen that was enslaved by the Reapers. We freed it. After that we helped prevent a war between turians and krogan by helping disarm a giant bomb.
In this part Liara came to our cabin. She shared with us her new project- recording of the galaxy history. Information about Reapers, Prothean weapon's blueprint...She wanted our input on about our own character. We told her to make us sound inspiring. Liara planed to use those recordings as a warning for future species in case we would fail to defeat the Reapers. After that we disscused our attack plan with Primarch Victus and Wrex. A reaper was near a Shroud that we intended to use to spread the cure for Genophage(a biological weapon created by salarians and deployed against the krogans by the turians. It made most krogans infertile). So we devised a plan. Turians will stike a reaper from the air while krogans will attack from the ground. After that we got a call from salarian leader(dalatrass). She offered us a shady deal. If we would pretend to cure the genophage we would get salarian support as well.
While driving to our destination Eve asked us if something is worrying us. We were not able to answer at that time. Then Wrex brother wanted to kill our friend Mordin. Eve managed to solve the conflict by telling angry krogan that they should fight Reapers instead. After that we revealed dalatrass shady offer to Wrex, Eve and Mordin. Mordin told us that thanks to this he will be able to fix salarian trap that would prevent curing the genophage. Fight against a reaper begun. Soon we were separated from krogan troops and had to find our way through some tunnels. Wrex warned us that Karlos a mother of all thresher maws(subterranean carnivores that spend their entire lives eating or searching for something to eat.) Karlos was so enoumus that she caused an earthquake just by traveling nearby. Finally we were reunited with our friends. Eve came up with a new plan- we just had to summon Karlos to fight the reaper. To do this we had to activate two giant hammers in the Arena near the Shroud facility.
Wrex declared that we are champion for krogan and brother to him. After that we activated the hammers and summoned Karlos. It appeared soon and for once Reaper had to fight someone bigger than it. Karlos was able to overpower and defeat the reaper, bringing him underground and killing it. After that we met with Mordin in the Shroud facility. He told us that he is going up to the top of the facility...and that he is not coming back alive. We said our goodbyes and Mordin went to the top, bypassed countermeasures that would prevent curing the genophage and then spread the cure. Shroud facility exploded and Mordin died but the cure was now spreading in the air. After more than a thousand years the genophage was finally cured. It was time for a new era. Wrex thanked us again. And Eve told us her real name- Bakara.
Back on the Normandy(our ship) we got a call from salarian Councilor. She had some information about humanity's Councilor Udina. Apparently he has done some illegal things. Salarian Councilor promised to tell us more the next time we will visit Citadel. After that we spoke with Joker(our pilot) and our bro Garrus about Mordin's sacrifice. Then we went to see Javik. He told us that had he been in a peaceful time maybe he would be a scholar like Liara wanted him to be. We were not convinced about that.