Asgard is a planet in Nemean Abyss. About 3 hundred years ago space explorers found this planet. On the surface they found ruins which were supposedly left by Protheans. Because of its location it quickly became the capital of Death, torture, raids and bandits. Many organization have grown there and operate in there. Currently the restoration of ruins was abandon from the end of Krogan Rebellions and fires of death. In the last century it became home of Ruronic Plague. Many Nuclear reactor here also destroyed the center of the planet.
It once had a title of cultural capital of Nemean Abyss but it was the wrong statement. The only monument build after protheans is the statue of Asari Matriarch Coolina, who founded and repopulated the planet.