The dwarves are a nomadic species of small humanoids known for their skills with the arcano-tech and magical entities. Since their homeworld Rannoch was conquered, they live aboard the Migrant Fleet, a huge collection of ships that travels as a single fleet.
Approximately three hundred years ago, they created the Geth, metal and wood humanoid shells embodied with magics to emulate rudimentary artificial intelligences, to serve as an efficient source of manual labor. However, when the Geth gradually became sentient, the Dwarves became terrified of possible consequences and tried to destroy their creations. The Geth won the resulting war and forced their creators into exile. Now the Dwarves wander the galaxy in a flotilla of salvaged ships, secondhand vessels, and recycled magical artefacts.