The asari homeworld has been called the "crown jewel of the galaxy," the "apex of democracy," and the "beating heart of galactic love." and during it's occupation by the Combines, "Tuikkiujik" Its republics have a remarkably low incidence of war, disease, violent crime or famine, riding a stable economy backed by wealthy colonies and Thessia's vast element zero reserves. Traces of eezo in the water and soil are so common that most life on Thessia has adapted to its presence.
during the Combine's Invasion of Riz'ro Galaxy, Thessia was one of first of many worlds to fall under occupation by the Combines. When the Citadel Alliance liberated the Planet, they found the native population forced into death camps with all the once beautiful cities of Thessia reduced to ruins