Immediatly after the Rachni Wars, Overlord Irogar was given the planet of Rargoth to rule over. In the Krogan Rebellions, this planet was the place where the Turian dreadnoughts Grexin, Nyhrua, Krestan and Ferox met their destruction. After the bloody battle, the Council had no option but to allow the Krogan to keep living in Rargoth.