Caleston

Description
The hostile moon Caleston is the largest satellite of the gas giant Cernunnos. An ancient asteroid strike deposited major loads of element zero within the molten sulfur mantle. Eldfell-Ashland Energy's mining operations have made it the largest source of starship drive core material in the Attican Traverse. Caleston is wracked with volcanism due to tidal stresses from Cernunnos. Because of the weak solar output, plant-like life on Caleston is not carbon-based and photosynthetic but silicon-based and thermosynthetic, requiring heat rather than sunlight to power its chemical reactions. These organisms flourish in volcanic vents and during solar flares when Balor can double or triple in luminosity. Sadly, sapient habitation is not possible here and Caleston's biodiversity is considered "threatened" by the Citadel Council Committee on Habitable Worlds.

Mineral Deposits
World Type: Desert

Trivia

 * Originally, Caleston was where the player was meant to first meet Liara T'Soni, in addition to multiple side missions. Due to scheduling and coding issues, Caleston saw severe content cuts during the development of Mass Effect before being eventually renamed Therum. Originally there was a human mining station that served as a hub. Much of the architecture for this station was later repurposed as the final fight location in Bring Down the Sky.
 * The "rescue miners" mission mentioned in the E3 demo never actually existed. That conversation was added to the demo purely for the purpose of showing off the capabilities of the cinematic conversation system.
 * Caleston is mentioned in the "Distress Call" teaser trailer / attract movie.