Mass Effect Wiki
Mass Effect Wiki

Location: AndromedaHeleus ClusterPytheas System Second planet



A desert world with significant resources, Eos is often wracked by deadly, radiation-contaminated storms. Catalogued as nonviable after numerous attempts to settle.

ALERT: Signal detected, similar to the devices on Habitat 07.


A desert world with significant resources, Eos is home to the first successful Andromeda Initiative outpost, Prodromos. (Founded by Pathfinder Ryder, Mayor August Bradley assigned.)

Codex Entry[]


Initial Entry[]

Eos, designated Habitat 1, was the earliest "golden world" identified for outpost placement. Named for the Greek goddess of dawn by Jien Garson personally, Eos embodied the hope of the Andromeda Initiative for a new start.

On arrival, the Nexus discovered that a world projected to be arid but comfortably habitable was now ravaged by radioactive fallout from the Scourge. The planet's atmosphere is wracked by storms that have spread the radiation across continents; periodic 130km/hr winds strip equipment and damage shuttles.

Reports from the Nexus include a sanitized account of two attempts to colonize the planet, both of which ended in failure and an unacceptable loss of life. There is also a significant kett presence on Eos, apparently investigating mysterious signals on the surface. Eos is now off-limits to unauthorized Nexus personnel, as the Nexus leadership believe it's no longer viable.

Eos Vault Activated[]

Activating the vault discovered below Eos' surface has had a dramatic and immediate effect. Radioactive particles are being stripped from the atmosphere by unknown means, and the resulting temperature changes are calming Eos' high winds. The planets moisture levels are already showing improvement.

Eos Outpost Established[]

Prodromos, the first Pathfinder-established outpost, has been founded in Fairwinds Basin, with Mayor August Bradley in charge. The Nexus is broadcasting footage of departing colonists and the new conditions on Eos across all communication channels.

Points of Interest[]



Overview of Eos' points of interest.

Location Name Description Associated Missions
1 Site 1: Promise Eastern region with the Nexus' first attempt at a colony. Failed due to inadequate preparation for radiation storms and kett attacks. A Better Beginning
Doesn't Add Up
Jaal Ama Darav: Friend or Foe?
Ryder Family Secrets
Something Personnel
Task: Drone Recovery
Task: Naming the Dead
Task: Research Center Development
The Secret Project
2 Site 2: Resilience Eastern region with the Nexus' second attempt at a colony. Massacred by kett. Doesn't Add Up
Jaal Ama Darav: Friend or Foe?
Task: Naming the Dead
The Secret Project
3 Fairwinds Basin Centrally located region. Prodromos outpost can be founded by Pathfinder Ryder in Fairwinds Basin. A Job for Danny Messier
Cora Harper: A Foundation
Cora Harper: Asari Ark
Doesn't Add Up
Gil Brodie: The Friend
Jaal Ama Darav: Friend or Foe?
Liam Kosta: Community
Life on the Frontier
Making An Impression
Missing Arks
Ryder Family Secrets
Shock Treatment
Task: Boosting the Signal
Task: Cultivation
Task: Pathfinder Armor Crafting
Task: Supply Loss and Recovery
Task: The Ghost of Promise
Task: Waking up to the Future
4 The Golden Wastes A sandy location in the eastern region. A Better Beginning
First Murderer
Task: Hitting Rocks for Science
Task: Naming the Dead
Task: What He Would Have Wanted
5 Four Giants Four large rock columns dominate this eastern region. Task: What He Would Have Wanted
6 Outland Spire Located on the northeastern side of the southern large lake. Peebee: Remnant Scanner
Task: Drone Recovery
7 The Sheartop A central northern plateau overlooking Prodromos and the Presson Dunes and the site of a major kett power generation facility. Defeating the Kett
8 Sawtooth Plateau Southwestern region filled with Remnant ruins and guarded by an Architect. Making An Impression
Task: Hitting Rocks for Science
Task: Remnant Data Cores
9 Presson Dunes The western desert plains with many dunes where the kett have erected many towering energy generators. Dissension in the Ranks
Kett's Bane
Task: Drone Recovery
Task: Hitting Rocks for Science
10 Blackrock Tande A mountainous raised plateau in the northwest region. Dissension in the Ranks
Jaal Ama Darav: Friend or Foe?
Task: Data Trail


Priority Ops
Allies and Relationships
Heleus Assignments
Additional Tasks


Architect Husk: Eos[]

Note: This anomaly is available after completing Making An Impression.
Classification: Enemy (decommissioned)
Origin: Andromeda (Eos)

This Remnant Architect's programming directives have been interrupted. It is in an orbital standby mode and remains tethered to its home planet Eos. The Architect's systems are completing recovery from severe radiation exposure. The Architect itself appears to be conducting monitoring and analysis of Eos' atmosphere.

Awards +50 Rd icon remnant orange when scanned.

Mineral Deposits[]

Environmental Information[]

Main article: Hazard
The barren surface of Eos

Eos is heavily contaminated by lethal levels of radiation prior to activation of the planet's vault. All areas outside of specially shielded zones like Site 1 pose an environmental hazard to personnel and vehicles.

  • Hazard Level 1 - RADIATION 0.041 mSv/hr
  • Hazard Level 3 - RADIATION 55.765 mSv/hr