Prerequisite: Priority: Tuchanka (Mass Effect 3)
Theseus is a former Prothean system. Three of its five worlds bear evidence of Prothean development. In modern times, ExoGeni Corporation has staked a claim on the ruins of Feros while the others are bereft of anything valuable, cost-ineffective for meaningful resource exploitation, or not thoroughly explored.
Feros[]
Feros is the second planet orbiting the star Theseus.
- Main article: Feros
- Mission: Feros: Geth Attack → Feros: The Thorian → Feros: Colony Saved | Feros: Colony Gone
- Assignment: Feros: Data Recovery
- Assignment: Feros: Geth in the Tunnels
- Assignment: Feros: Power Cells
- Assignment: Feros: Varren Meat
- Assignment: Feros: Water Restoration
Logan[]
Logan is the fifth planet orbiting the star Theseus.
- Main article: Logan
Quana[]
Quana is the fourth planet orbiting the star Theseus.
- Main article: Quana
- Survey: UNC: Valuable Minerals: Light Metal ×1
Sharring[]
Sharring is the third planet orbiting the star Theseus.
- Main article: Sharring
- Collection: UNC: Prothean Data Discs: Prothean Data Discs ×1
Sytau[]
Sytau is the first planet orbiting the star Theseus.
- Main article: Sytau
Trivia[]
- The system is named for the mythological Greek hero Theseus. Theseus was said to have slain the Minotaur in the Cretan Labyrinth.