The asari homeworld, Thessia, is the core of the largest economy in the Milky Way. The planet's reserves of element zero are so vast that they affect its price galaxy-wide. Because life on Thessia evolved in an eezo-rich environment, the world is home to a wealth of both biotically active and eezo-resistant species. Travel to the planet is strictly controlled, but smuggling remains an issue.
Thessia is host to varying republics instead of a single government and, although each maintains a formidable military, it is notable for having long been free of internal or external wars. The asari are renowned for their cultural and political dominance, and they excel in ambassadorial ventures. They have a strong presence in Citadel politics and galactic policy. However, it is the unfocused political structure of their homeworld that has left the Thessians unprepared for the current conflict.