Plot[ edit ] The Reapers invade and quickly overwhelm Earth. After being reinstated by Anderson, who stays behind to rally resistance, Shepard is ordered to Mars by Hackett. The Alliance begins construction on the superweapon, dubbed the "Crucible", while Shepard is ordered to earn support from other species. The krogan leader, either Urdnot Wrex or Wreav, refuses unless the genophage is cured. Shepard and the krogan leader travel to the salarian homeworld, Sur'Kesh,  where they rendezvous with a salarian ally, either Mordin Solus or Padok Wiks, along with a female krogan named Eve. After the salarian formulates a cure, they hatch a plan to disperse it using a tower called the "Shroud" on the krogan homeworld, Tuchanka.
Novels[ edit ] Mass Effect: Revelation , by Drew Karpyshyn: The first novel based on Mass Effect, the plot is centred around then-Lieutenant David Anderson and tells the story of how he came to know Saren as well as the beginning of his relationship with Kahlee Sanders. It expands on the history of the Mass Effect universe and reveals in detail how Anderson failed to become the first human Spectre. Ascension , by Drew Karpyshyn: The second novel based on Mass Effect, the plot centres around protagonist Paul Grayson, a member of Cerberus, who is in charge of raising a biotic girl named Gillian.